# Ladasten — High-Purity Chemical Reagents for Laboratory Research > Ladasten is an independent research & development chemistry laboratory. We synthesise high-purity chemical reagents — including novel research compounds that do not yet have an assigned CAS number — and verify every batch by GC-MS / HPLC before it ships. Manufactured and shipped from Poland and the United Kingdom. All Ladasten products are chemical reagents supplied strictly for laboratory and analytical research. They are not for human consumption, are not dietary supplements, food, cosmetics or medicines, and are not for veterinary use. Buyers must be 18+. We do not ship to the USA, Israel or Russia. A certificate of analysis is available on request; if an independent analysis shows purity below the declared specification, we refund the product and the buyer's testing costs. ## About & policies - [About & Lab Verification](https://ladasten.com/about/): who we are, in-house R&D synthesis including non-CAS compounds, and the GC-MS / HPLC batch-verification process - [Rules & Policy](https://ladasten.com/rules-policy/): research-use terms, shipping, purity guarantee, refunds and the results-sharing bonus - [Contact](https://ladasten.com/contact/): custom synthesis requests and support ## Product categories - [Nootropic Reagents](https://ladasten.com/product-category/nootropic-reagents/) - [Anesthetic Reagents](https://ladasten.com/product-category/anesthetic-reagents/) - [Neuro & Metabolic Reagents](https://ladasten.com/product-category/neuro-metabolic-reagents/) - [Pure Substances](https://ladasten.com/product-category/pure-substances/) - [Shop — all reagents](https://ladasten.com/shop/) ## Reagents - [Bromantane](https://ladasten.com/buy/bromantane/): CAS 87913-26-6, C16H20BrN, 306.24 g/mol, GC-MS / HPLC verified ≥99.75% — research reagent, laboratory use only - [L-DOPA (Levodopa)](https://ladasten.com/buy/l-dopa/): CAS 59-92-7, C9H11NO4, 197.19 g/mol, GC-MS / HPLC verified ≥99.52% — research reagent, laboratory use only - [Methylene Blue](https://ladasten.com/buy/blue/): CAS 61-73-4, C16H18ClN3S, 319.85 g/mol, GC-MS / HPLC verified ≥99.50% — research reagent, laboratory use only - [Modafinil](https://ladasten.com/buy/modafinil/): CAS 68693-11-8, C15H15NO2S, 273.35 g/mol, GC-MS / HPLC verified ≥99.50% — research reagent, laboratory use only - [FLModafinil](https://ladasten.com/buy/flmodafinil/): CAS 90280-13-0, C15H13F2NO2S, 309.33 g/mol, GC-MS / HPLC verified ≥99% — research reagent, laboratory use only - [Benzocaine](https://ladasten.com/buy/benzocaine/): CAS 94-09-7, C9H11NO2, 165.19 g/mol, GC-MS / HPLC verified ≥99.52% — research reagent, laboratory use only - [Lidocaine](https://ladasten.com/buy/lidocaine/): CAS 137-58-6, C14H22N2O, 234.34 g/mol, GC-MS / HPLC verified ≥99.48% — research reagent, laboratory use only - [Noopept](https://ladasten.com/buy/noopept/): CAS 157115-85-0, C17H22N2O4, 318.37 g/mol, GC-MS / HPLC verified ≥99.48% — research reagent, laboratory use only - [Aniracetam](https://ladasten.com/buy/aniracetam/): CAS 72432-10-1, C12H13NO3, 219.24 g/mol, GC-MS / HPLC verified ≥99% — research reagent, laboratory use only - [Alpha-GPC](https://ladasten.com/buy/alpha-gpc/): CAS 28319-77-9, C8H20NO6P, 257.22 g/mol, GC-MS / HPLC verified ≥99% — research reagent, laboratory use only - [Sunifiram (DM-235)](https://ladasten.com/buy/sunifiram/): CAS 314728-85-3, C14H18N2O2, 246.30 g/mol, GC-MS / HPLC verified ≥99.12% — research reagent, laboratory use only - [Pramiracetam](https://ladasten.com/buy/pramiracetam/): CAS 68497-62-1, C14H27N3O2, 269.38 g/mol, GC-MS / HPLC verified ≥99% — research reagent, laboratory use only - [PRL-8-53](https://ladasten.com/buy/prl-8-53/): CAS 51352-87-5, C18H22ClNO2, 319.83 g/mol, GC-MS / HPLC verified ≥99% — research reagent, laboratory use only - [Oxiracetam](https://ladasten.com/buy/oxiracetam/): CAS 62613-82-5, C6H10N2O3, 158.16 g/mol, GC-MS / HPLC verified ≥99% — research reagent, laboratory use only - [Tadalafil](https://ladasten.com/buy/tadalafil/): CAS 171596-29-5, C22H19N3O4, 389.40 g/mol, GC-MS / HPLC verified ≥99% — research reagent, laboratory use only - [Mebicar](https://ladasten.com/buy/mebicar/): CAS 10095-06-4, C8H14N4O2, 198.22 g/mol, GC-MS / HPLC verified ≥99% — research reagent, laboratory use only - [Procaine HCl](https://ladasten.com/buy/procaine-hcl/): CAS 51-05-8, C13H21ClN2O2, 272.77 g/mol, GC-MS / HPLC verified ≥99% — research reagent, laboratory use only - [Apigenin](https://ladasten.com/buy/apigenin/): CAS 520-36-5, C15H10O5, 270.24 g/mol, GC-MS / HPLC verified ≥99% — research reagent, laboratory use only - [Bromantane — BROCAPS capsules](https://ladasten.com/buy/bromantan/): CAS 87913-26-6, C16H20BrN, 306.24 g/mol, GC-MS / HPLC verified ≥99.75% — research reagent, laboratory use only - [Bromantane — BOOM-BRO capsules](https://ladasten.com/buy/30x-boom-bro-capsules-30x200mg-of-bromantane/): CAS 87913-26-6, C16H20BrN, 306.24 g/mol, GC-MS / HPLC verified ≥99.75% — research reagent, laboratory use only ## Molecule encyclopedia (3D models + chemical data) - [Molecule encyclopedia](https://ladasten.com/encyklopedia-molekul/): interactive 3D structure, GHS data and PubChem / ChEMBL / NIST chemical data for each compound; standalone pages at /molekula// - [Detailed machine index (llms-full.txt)](https://ladasten.com/llms-full.txt): auto-generated full data export ## Research Digest (blog) Peer-reviewed literature summaries on the reference compounds in this catalogue, written by Aleister LaVey. Every article cites its primary sources by PMID or DOI and states plainly where the evidence base is thin. Published three times a week; the index below lists the full planned corpus, including articles scheduled for future dates that are not yet publicly readable. - [Research Digest index](https://ladasten.com/blog/): all articles, newest first ### Mechanisms of action - [Alpha-GPC's Mechanism of Action: Precursor Delivery, Not Receptor Activity](https://ladasten.com/alpha-gpc-choline-precursor-mechanism/): Alpha-GPC in the primary literature: carbon-14 tracing into acetylcholine, plasma choline versus citicoline, and what the dementia trials really show. - [Cholinergic Precursors: Four Delivery Strategies, One Head-to-Head Comparison, and a Shared Liability](https://ladasten.com/cholinergic-precursors-delivery-strategies-compared/): Payload arithmetic, the one head-to-head plasma choline trial, what citicoline becomes before absorption, and the TMAO route all four share. - [Aniracetam's Mechanism of Action: An AMPA Modulator That Largely Arrives as Its Metabolites](https://ladasten.com/aniracetam-mechanism-of-action/): Aniracetam blunts AMPA desensitisation in vitro, but under 12% survives first pass. Its metabolites carry much of the in vivo pharmacology. - [The Racetam Family: A Suffix That Outlived Its Scaffold](https://ladasten.com/racetam-family-structural-relationships/): Which racetams share the 2-pyrrolidinone scaffold, which do not, and what the 4-hydroxyl, the anisoyl and the diisopropylaminoethyl group each change. - [Apigenin's Mechanism of Action: Benzodiazepine-Site Binding Without GABA Potentiation](https://ladasten.com/apigenin-gaba-a-mechanism/): Apigenin binds the benzodiazepine site but antagonises GABA-A currents. What electrophysiology, NF-kB work and human absorption data actually show. - [Benzocaine's Mechanism of Action: Why an Uncharged Blocker Takes the Lipid Route](https://ladasten.com/benzocaine-uncharged-sodium-channel-block/): How benzocaine blocks sodium channels without a charge: Hille's hydrophobic pathway, the NavAb fenestration route, and why use-dependence is absent. - [Bromantane's Mechanism of Action: Enzyme Induction, Not Stimulation](https://ladasten.com/bromantane-mechanism-of-action/): Bromantane upregulates tyrosine hydroxylase and AAAD expression rather than acting on dopamine release. - [FLModafinil Mechanism of Action: Five Direct Papers, and Why the Rest Is Modafinil](https://ladasten.com/flmodafinil-mechanism-of-action/): Only five indexed papers examine flmodafinil (CRL-40,940), and one gave it to humans. What each shows, and what is extrapolated from modafinil. - [L-DOPA's Mechanism of Action: Decarboxylase Geography Decides the Outcome](https://ladasten.com/l-dopa-mechanism-of-action-decarboxylase-geography/): L-DOPA is a substrate, not a ligand. Where AADC sits decides the outcome: gut bacterial decarboxylase, transport competition and gene-therapy evidence. - [Lidocaine's Mechanism of Action: The Channel's State Sets the Affinity](https://ladasten.com/lidocaine-state-dependent-sodium-channel-block/): How lidocaine blocks sodium channels: inactivated-state affinity, use-dependence, the IVS6 binding site and the two access routes Hille predicted in 1977. - [Local Anaesthetics as Research Tools: Charge, State and the Three-Compound Experiment](https://ladasten.com/local-anaesthetics-sodium-channel-research-tools/): Two access routes, thirty-fold state dependence and a neutral negative control: how to use benzocaine, procaine and lidocaine as one experiment. - [Methylene Blue's Mechanism of Action: A Redox Catalyst, Not a Receptor Ligand](https://ladasten.com/methylene-blue-mechanism-of-action-redox-catalyst/): How methylene blue works: alternative mitochondrial electron transfer, a hormetic dose-response, MAO-A inhibition and the negative phase 3 tau trial. - [Modafinil's Mechanism of Action: The Dopamine Transporter Answer and What It Still Fails to Explain](https://ladasten.com/modafinil-mechanism-of-action-dopamine-transporter/): What the primary literature reports on modafinil and the dopamine transporter: knockout genetics, PET occupancy figures and why orexin was ruled out. - [Noopept's Mechanism of Action: The Molecule You Dose Is Not the One That Acts](https://ladasten.com/noopept-mechanism-of-action-prodrug/): Noopept is undetectable in rat brain an hour after dosing. What the primary literature reports on its active metabolite, HIF-1 and neurotrophins. - [Oxiracetam's Mechanism of Action: Cholinergic Facilitation Without an Identified Receptor](https://ladasten.com/oxiracetam-mechanism-of-action/): No receptor has been identified for oxiracetam. What the acetylcholine, PKC and release studies constrain, and where the clinical trials disagree. - [Pramiracetam's Mechanism of Action: Choline Uptake, Not Receptor Binding](https://ladasten.com/pramiracetam-choline-uptake-mechanism/): What the primary literature reports on pramiracetam: high-affinity choline uptake, an inverted U dose-response, and an unexplained adrenal requirement. - [Procaine Hydrochloride's Mechanism of Action: A Cation at the Channel, an Ester in the Plasma](https://ladasten.com/procaine-hydrochloride-cation-and-ester/): Procaine's sodium channel kinetics, esterase hydrolysis to PABA, LC-MS/MS quantification, and why the ester-allergy assumption did not survive testing. - [Tadalafil's Mechanism of Action: PDE6 Selectivity Bought at PDE11's Expense](https://ladasten.com/tadalafil-pde5-selectivity/): Tadalafil in the primary literature: PDE5 catalytic-site inhibition, a 17.5 h half-life, and why any PDE11 potency figure depends on the isoform. ### Pharmacokinetics and metabolism - [Alpha-GPC Pharmacokinetics: The Molecule Is Cut in the Gut, and the Microbiota Take a Share](https://ladasten.com/alpha-gpc-pharmacokinetics-tmao/): Alpha-GPC is hydrolysed before absorption by ENPP6 and Gpcpd1. What rat radiolabel data, the human single-dose trial and the TMAO stroke data show. - [Apigenin Pharmacokinetics: Almost Nothing Is Absorbed, and What Circulates Is No Longer Apigenin](https://ladasten.com/apigenin-pharmacokinetics-conjugates/): Why apigenin bioavailability ranges from 0.22% to 34%: enteric recycling, UGT and SULT conjugation, gut microbiota and the food matrix. - [Bromantane Pharmacokinetics: Inferred From Effect Time-Courses, Not Measured Concentrations](https://ladasten.com/bromantane-pharmacokinetics/): One indexed PK study, an 8-hour biphasic EEG signal and a LogP near 5: what is actually measured about bromantane ADME, and what is only inferred. - [L-DOPA Pharmacokinetics: Two Separate Bottlenecks, and Carbidopa Removes Only One](https://ladasten.com/l-dopa-pharmacokinetics-two-bottlenecks/): Meals cut peak levodopa 29%. Amino acids abolish the effect without touching plasma. Half-life 1.5 h, carbidopa dose-response, COMT and 3-O-methyldopa. - [Lidocaine Pharmacokinetics: Clearance Limited by Liver Blood Flow, Not Enzyme Capacity](https://ladasten.com/lidocaine-pharmacokinetics-flow-limited-clearance/): Oral bioavailability 31%, so it is not given by mouth. Clearance tracks liver blood flow: 11.8 vs 7.2 mL/min/kg in heart failure. MEGX and GX explained. - [Methylene Blue Pharmacokinetics: The Analyte Changes Oxidation State Between Dose and Assay](https://ladasten.com/methylene-blue-pharmacokinetics-leuco-form-azure-b/): Oral bioavailability 72% in plasma but far lower in whole blood: why matrix decides. Terminal half-life 5.25 h, azure B metabolite, G6PD and MAO-A. - [Modafinil Pharmacokinetics: One Half-Life Figure Hiding Two Enantiomers That Clear at Different Rates](https://ladasten.com/modafinil-pharmacokinetics-enantiomers/): Half-life 12-15 h averages two enantiomers cleared at different rates. Amide hydrolysis, CYP3A4 induction and why armodafinil is not half a dose. - [Noopept Pharmacokinetics: A Prodrug Whose Active Metabolite the Brain Already Makes](https://ladasten.com/noopept-pharmacokinetics-cycloprolylglycine/): Parent undetectable in rat brain at one hour while cyclo-L-prolylglycine rose 2.5-fold. What that means for assay design and species extrapolation. - [Tadalafil Pharmacokinetics: A 17.5-Hour Half-Life Made by Low Clearance, Not Tissue Retention](https://ladasten.com/tadalafil-pharmacokinetics-low-clearance-long-half-life/): Half-life 17.5 h comes from clearance 2.48 L/h and volume 62.6 L, not tissue retention. Bosentan cuts exposure 41.5%; the food-effect claim is narrower. ### Analytical methods and identity - [Analysing Alpha-GPC: Nothing to Detect, and a Mass That Changes While You Weigh It](https://ladasten.com/analysing-alpha-gpc-hygroscopicity-detection/): No UV chromophore, two commercial forms and a solid that takes up water. Refractive index, aerosol detectors, 31P NMR and an enzymatic route compared. - [Why CAS Numbers Matter More Than Compound Names: Two Identifiers, Two Different Failures](https://ladasten.com/cas-numbers-versus-compound-names/): PubChem finds no structure for "alpha-GPC"; its CAS number resolves instantly. In PubMed the same CAS returns zero records. Measured, both directions. - [Analysing Aniracetam: The Calibration Ranges Show You Are Measuring the Wrong Molecule](https://ladasten.com/aniracetam-analysis-parent-versus-metabolite/): Why aniracetam assays miss the point: 8.75 ng/mL after 400 mg, four hydrolysis impurities, and a brain metabolite with no chromophore. - [Analysing Apigenin: The Nearest Impurity Differs by One Hydroxyl and Is Also Its Own Metabolite](https://ladasten.com/analysing-apigenin-luteolin-glycosides-purity/): Luteolin is one hydroxyl from apigenin and is also its metabolite. Three glycosides share a formula. What a plant-derived 98% figure actually means. - [Flavonoids as Reference Standards: The Specification Measures a Class, Not a Compound](https://ladasten.com/flavonoids-as-reference-standards-purity/): A hydrolyse-then-measure flavonoid assay counts a class, and a class can be topped up. What an apigenin certificate has to state to mean anything. - [Analysing Benzocaine: The Compendial Compound Whose Impurity Is Also Its Degradant](https://ladasten.com/benzocaine-analysis-paba-stability-indicating/): Why a benzocaine purity figure needs a date, which wavelength to use at which pH, and what the chromatogram cannot see about the solid form. - [Analysing Bromantane: A Prohibited Substance With One Detection Paper and No Published Method](https://ladasten.com/analysing-bromantane-detection-identity/): One indexed detection paper, no published excretion profile, no metabolite targets. What the bromine doublet, NMR and qNMR establish for bromantane. - [Actoprotectors: Forty-Seven Indexed Records, and What a Drug Category Loses in Translation](https://ladasten.com/actoprotectors-category-language-barrier/): 47 records, 39 in Russian, and an English-language footprint made of two Seoul reviews and doping-control papers. What that does to the evidence base. - [Analysing FLModafinil: Mass Spectrometry Sees the Formula, Not the Sulfur](https://ladasten.com/analysing-flmodafinil-stereochemistry-mass-spectrometry/): Why GC-MS misidentifies CRL-40,940, what the 2026 human LC-HRMS study fixes, and how chiral chromatography resolves a sulfoxide MS cannot see. - [Analysing L-DOPA: The Sample Degrades Before Injection and the Detector Sees Catechols](https://ladasten.com/analysing-l-dopa-oxidation-and-chirality/): L-DOPA oxidises in hours without antioxidant and electrochemical detection is not structure-specific. Stability data, HPLC-ECD and enantiomeric purity. - [Analysing Lidocaine: Three Molar Masses for One Molecule, and an Impurity That Is Also Its Metabolite](https://ladasten.com/analysing-lidocaine-salt-form-and-xylidine/): Free base, hydrochloride or monohydrate changes every number. Plus 2,6-xylidine: impurity, degradant and metabolite, with the methods that measure it. - [Mebicar Analysis: A Symmetrical Glycoluril That Reversed-Phase HPLC Barely Retains](https://ladasten.com/mebicar-analysis-glycoluril-hplc/): No chromophore, minimal C18 retention, two NMR singlets, one indexed method from 1979. What it takes to assay tetramethylglycoluril properly. - [Analysing Methylene Blue: The Absorbance at 665 nm Reports Oxidation State, Not Content](https://ladasten.com/analysing-methylene-blue-redox-azure-b/): Why 665 nm absorbance is not a purity figure: the leuco form, monomer-dimer equilibrium, azure B as impurity and metabolite, and cation chromatography. - [Analysing Modafinil: The Achiral Number Is a Sum Over Two Molecules That Clear at Different Rates](https://ladasten.com/analysing-modafinil-chiral-separation/): Chiral HPLC for modafinil: cyclodextrin and polysaccharide phases, the sulfide-sulfone impurity ladder, urine and hair detection, deuterated standards. - [Reference Standard vs Bulk Material: ≥99% Certifies a Peak Area, Not a Mass Fraction](https://ladasten.com/reference-standard-vs-bulk-material-purity/): Peak area is not mass fraction. What a ≥99% figure leaves unmeasured: water, residual solvent, solid form, stereochemistry, and the measurement date. - [Racemic vs Enantiopure Reference Material: Five Compounds Where the Distinction Changed the Answer](https://ladasten.com/racemic-vs-enantiopure-reference-material/): A racemate is two compounds and an achiral assay reports one. What decides whether the distinction changes your result, across five verified cases. - [Analysing Noopept: Its Active Metabolite Is Endogenous, So the Blank Is Never Zero](https://ladasten.com/analysing-noopept-endogenous-metabolite/): Noopept's metabolite cycloprolylglycine is endogenous, so there is no blank matrix. Baseline disagreement, surrogate matrix methods and ester instability. - [Analysing Oxiracetam: An Achiral Assay Cannot See the Only Variable That Matters](https://ladasten.com/oxiracetam-chiral-hplc-enantiomer-analysis/): Chiralpak ID and AD-3 conditions, why amino columns replace C18, and the degradant that sits 0.984 Da from the parent. - [PRL-8-53: One Published Study, Two Molecular Formulae and Why the Salt Form Decides Your Concentrations](https://ladasten.com/prl-8-53-identity-salt-form-analysis/): Free base 283.37 or hydrochloride 319.83? One HCl, 12.9% error in every concentration. What the single 1978 paper says and how to verify identity. - [Analysing Pramiracetam: A Strong Base With No Chromophore, and One Published Method](https://ladasten.com/pramiracetam-analysis-basic-compound-chromatography/): Why a strongly basic racetam tails on C18, what nitrogen-specific detection bought in 1983, and the 27% mass difference between base and sulfate. - [Analysing Procaine Hydrochloride: The Compendial Titration Counts Its Own Degradation Product](https://ladasten.com/procaine-hydrochloride-analytical-specificity/): Nitrite titration counts PABA too, and diethylaminoethanol is invisible by UV. What a stability-indicating procaine method actually has to resolve. - [Salt Forms and Free Bases: A Systematic Error That Does Not Average Out](https://ladasten.com/salt-forms-free-bases-molar-mass/): Procaine HCl is 86.6% base, pramiracetam sulfate 73.3%. Why the wrong molar mass gives a 15-36% error that replication can never reveal. - [Verifying Sunifiram: Identity Confirmation for a Compound With a Fourteen-Paper Literature](https://ladasten.com/verifying-sunifiram-identity-analysis/): Sunifiram has 14 usable papers from two laboratories. Confirming identity and purity by LC-MS, high-resolution mass and qNMR when literature cannot help. - [Analysing Tadalafil: Twenty-One Known Analogues Mean a Targeted Screen's Negative Proves Nothing](https://ladasten.com/analysing-tadalafil-analogues-targeted-screening/): Eighty PDE-5 adulterants, twenty-one of them tadalafil analogues. What targeted screens miss, how to quantify without a standard, and why 3 ug/mL matters. ### Stability, storage and handling - [Alpha-GPC Stability: The Compound Weighs Whatever the Room's Humidity Decides](https://ladasten.com/alpha-gpc-stability-hygroscopicity-and-weighing/): Alpha-GPC resists heat, light, oxidation and acid, and fails to humidity instead. What deliquescence does to a weighing, and why form must be declared. - [Aniracetam Stability: The Impurity List and the Metabolite List Are the Same List](https://ladasten.com/aniracetam-stability-imide-hydrolysis/): Its related substances are its metabolites. Why the acyl-nitrogen bond that fails in the gut is the same bond that fails in a damp jar. - [Apigenin Stability: The Hydroxyls That Make Quercetin Fragile Are the Ones Apigenin Lacks](https://ladasten.com/apigenin-stability-oxidation-and-plant-origin/): Apigenin lacks quercetin's 3-OH and catechol, and the measured data show it. pKa 6.6 and 9.3, metal binding, and why plant-derived batches differ. - [DMSO Stock Solutions: Starting Purity Mattered More Than Freeze-Thaw Cycles](https://ladasten.com/dmso-stock-solutions-freeze-thaw-stability/): A 1536-well plate takes up 6% water in an hour, half a library is undetectable within a year, and freeze-thaw count was not the variable that mattered. - [Benzocaine Stability: Two Clocks Run at Once, and the Chromatogram Reads Only One](https://ladasten.com/benzocaine-stability-hydrolysis-kinetics-polymorphs/): Measured hydrolysis kinetics, the salt effect that doubles the rate constant, and the polymorph change milling causes that no chromatogram reports. - [Bromantane Stability: The Bromine Is the Weak Point, and Light Is What Finds It](https://ladasten.com/bromantane-stability-photolysis-aryl-bromide/): No stability study exists. Why the aryl C-Br bond, not the adamantane cage, decides how bromantane is stored, and what the PBDE data show. - [FLModafinil Stability: A Sulfoxide That Can Degrade in Two Directions at Once](https://ladasten.com/flmodafinil-stability-sulfoxide-redox-ladder/): One published degradation study, run inside a GC injector. What the sulfoxide, the primary amide and the two fluorines actually do on storage. - [L-DOPA Stability and Storage: Colour Is the Last Symptom, Not the First](https://ladasten.com/l-dopa-stability-oxidation-darkening/): Quinone, cyclodopa, dopachrome, melanin: the darkening sequence with real numbers, why trace metals set the rate and when an antioxidant made it worse. - [Lidocaine Stability: The Amide Bond Holds Where Procaine's Ester Gives Way](https://ladasten.com/lidocaine-stability-amide-versus-ester/): Forced degradation found no lidocaine degradants in 72 h. Why the amide outlasts procaine's ester, and why 2,6-xylidine still sets the limit. - [Mebicar Stability: A Molecule With Nothing Left to Break, and Why That Complicates the Study](https://ladasten.com/mebicar-stability-glycoluril-resistance/): Tetramethylglycoluril has almost nothing left to degrade. How to prove stability when forced degradation produces no degradant, and what still fails. - [Methylene Blue Stability: Demethylation Turns the Compound Into Its Own Impurities](https://ladasten.com/methylene-blue-stability-demethylation-azures/): Demethylation to the azures is the main degradation route, recognised since the 1800s. Why fading is not degrading, and what a specification must state. - [Light-Sensitive Compounds in the Laboratory: Amber Glass Is a Guess Until You Know the Wavelength](https://ladasten.com/light-sensitive-compounds-amber-glass-photostability/): Amber glass finished last of three protective containers in the only comparative test, and ten of eighteen compounds have no photostability data. - [Modafinil Stability and Storage: The Sulfone Peak Has Three Possible Histories](https://ladasten.com/modafinil-stability-sulfone-and-storage/): The sulfone is a process impurity, a degradant and a metabolite at once. What has been measured about modafinil storage, and what has not. - [Noopept Stability and Storage: The Ester Hydrolyses in the Bottle, the Ring Does Not](https://ladasten.com/noopept-stability-ester-hydrolysis-storage/): No stability study exists for noopept. Which bond breaks in a sealed vial, why the diketopiperazine cannot form there, and the 28 Da that reports it. - [Hygroscopic Reference Materials: The Property Everyone Cites and Nobody Has Measured](https://ladasten.com/hygroscopic-reference-materials-weighing-errors/): No published critical relative humidity exists for alpha-GPC, noopept or pramiracetam. What measured analogues say, and the arithmetic of a wet weighing. - [Oxiracetam Stability: Water Decides It, and Racemisation Does Not](https://ladasten.com/oxiracetam-stability-water-not-racemisation/): The C-4 stereocentre has no route to racemise on a shelf. The amide does hydrolyse, and solid-state reaction starts below the deliquescence point. - [PRL-8-53 Stability: The Ester Bond Decides the Shelf Life, and Nobody Has Measured It](https://ladasten.com/prl-8-53-ester-hydrolysis-stability/): One 1978 paper, one hydrolysable ester, no published kinetics. The pH-rate profile, the solid-state water layer and the m/z 270 degradation product. - [Pramiracetam Stability: The Salt Form Is a Stability Decision, Not a Molar-Mass Footnote](https://ladasten.com/pramiracetam-stability-salt-form-solvate/): No published stability study for pramiracetam. Why the amine oxidises only above pH 8, why the sulfate salt protects it, and what the solvate does to mass. - [Procaine Hydrochloride Stability: The Shelf Life Is Set by pH, and at pH 7.4 It Is Two Days](https://ladasten.com/procaine-hydrochloride-stability-hydrolysis-nitrosamine/): Two days to 90% at pH 7.4, first-order in hydroxide, and a measured nitrosation screen in which procaine gave no detectable volatile nitrosamine. - [Sunifiram Stability and Storage: No Amine to Oxidise, and Why Peroxides Still Set the Rules](https://ladasten.com/sunifiram-stability-oxidation-storage/): No stability study exists for sunifiram. No ester, no basic amine: why peroxide stressing misses the point and where the real degradation risk sits. - [Tadalafil Stability: The Main Degradant Has the Same Mass as the Drug](https://ladasten.com/tadalafil-stability-epimerisation-not-hydrolysis/): 99% retained over 91 days, yet the real route is epimerisation at C6 and C12a. Why mass spectrometry misses it and why polymorph is the shelf risk. ### Research reviews and evidence quality - [Alpha-GPC Research Review: One Trial Reported Six Times, and a Risk Signal From Twelve Million People](https://ladasten.com/alpha-gpc-research-review-one-trial-six-reports/): Six of eight ASCOMALVA records report one unfinished trial. A 12-million-person cohort found 43% higher stroke risk. The alpha-GPC evidence, counted. - [Aniracetam Research Review: The Trials Ended Before the Pharmacology Began](https://ladasten.com/aniracetam-research-review-trials-before-pharmacology/): 320 records, five human trials all from 1980-1991, two of them negative, and every one run before the brain-exposure data existed. The evidence, counted. - [Apigenin Research Review: Eight Thousand Records and No Human Efficacy Trial](https://ladasten.com/apigenin-research-review-human-evidence-gap/): 8365 indexed records, 16 randomised trials, and not one testing apigenin itself for a clinical outcome. What the human pharmacokinetics do to the rest. - [Benzocaine Research Review: The Hydroxylamine Metabolite Explains Most of the Modern Literature](https://ladasten.com/benzocaine-research-review-methemoglobinemia/): What 1,702 benzocaine records contain: the hydroxylamine mechanism, FDA adverse-event data, a 0.115% incidence estimate, and randomised efficacy trials. - [Bromantane Research Review: Seventy-Four Records, One Placebo-Controlled Trial, and Nothing New Since 2014](https://ladasten.com/bromantane-research-review-evidence-quality/): 74 indexed records, 54 in three journals, one placebo-controlled trial and nothing new since 2014. The bromantane evidence base, counted and graded. - [FLModafinil Research Review: Six Papers, Five Laboratories, No Replication](https://ladasten.com/flmodafinil-research-review-six-papers/): Ten PubMed records, six about the compound, four false positives from one token. One human study in six volunteers, no clinical trial, no replication. - [L-DOPA Research Review: Thirty-Two Thousand Records, and Selection Is the Only Hard Part](https://ladasten.com/l-dopa-research-review-evidence-quality/): 32,452 records, 1,250 randomised trials, a third not about Parkinson's. Two landmark trials that disagreed, and the questions scale can finally close. - [Lidocaine Research Review: Forty Thousand Records and One Indication the Evidence Took Away](https://ladasten.com/lidocaine-research-review-reversed-indication/): 39,610 records and 6196 randomised trials. How infarction prophylaxis was removed by cumulative evidence, and why the pain trials stay low-tier. - [Methylene Blue Research Review: Thirty Thousand Records and Eleven Randomised Trials](https://ladasten.com/methylene-blue-research-review-evidence-map/): Most methylene blue papers are not pharmacology. Where the randomised evidence actually is, where it is absent, and how the indexing misleads. - [Modafinil Research Review: Small Effects Where the Evidence Is Strong, Weak Evidence Everywhere Else](https://ladasten.com/modafinil-research-review-registered-versus-off-label/): 2,416 records, 338 randomised trials. Narcolepsy and sleep apnoea hold up with small effects; MS fatigue and schizophrenia do not. Counted and graded. - [Noopept Research Review: 115 Records, Half of Them Sharing Three Authors](https://ladasten.com/noopept-research-review-one-network-evidence-base/): 115 records, 56 sharing three authors, 69 in three journals, three clinical-trial records and no placebo trial. The noopept evidence base, measured. - [Oxiracetam Research Review: Two Large Trials, Seven Weeks Apart, Opposite Results](https://ladasten.com/oxiracetam-research-review-two-trials-opposite-results/): 590 patients positive in Dec 2025, 500 patients negative in Jan 2026, a literature with a hole in the 2000s, and no receptor after forty years. - [Pramiracetam Research Review: Forty-Three Records, Thirteen With Humans, None Since 2014](https://ladasten.com/pramiracetam-research-review-small-evidence-base/): Four usable human efficacy studies, one of them negative, and nothing indexed since April 2014. The pramiracetam evidence base, read record by record. - [Procaine Research Review: Large, Old, and Partly About a Different Drug](https://ladasten.com/procaine-research-review-evidence-quality/): 13,781 records, but 31% of title hits are procaine penicillin or procainamide. A Cochrane review, two retractions and a literature centred on 1955. - [Tadalafil Research Review: Three Thousand Records, and the Failures Are the Informative Ones](https://ladasten.com/tadalafil-research-review-registration-evidence/): 3202 records, 354 randomised trials, 243 of them in two indications. What tadalafil's evidence base covers, and what its failed trials settle. ### Discovery, history and synthesis - [Alpha-GPC: A Metabolite First, a Product Second, and Never Really a Solid](https://ladasten.com/alpha-gpc-discovery-metabolite-before-product/): From semen, milk and the renal medulla to soya lecithin hydrolysis: how an endogenous phosphatidylcholine metabolite became a marketed substance. - [Apigenin: A Flavone Named After Celery, Extracted Rather Than Synthesised](https://ladasten.com/apigenin-discovery-extraction-not-synthesis/): Apiin, weld dye, a 1957 spasmolytic note and flavone synthase I: where apigenin actually comes from, and why extraction still beats synthesis. - [Bromantane's Discovery and Synthesis: The West Met It as a Doping Case, Not as a Paper](https://ladasten.com/bromantane-discovery-synthesis-history/): 329 adamantane derivatives, six records before Atlanta 1996, one Lancet letter, and a synthesis published eighteen years later. The measured history. - [Reading a Certificate of Analysis: What a Purity Number Is Made Of, and What It Cannot See](https://ladasten.com/reading-a-certificate-of-analysis/): Mass balance, qNMR, salt forms, polymorphs and dated impurities: the six questions that decide whether an assay figure means anything. - [L-DOPA: Two Nobel Prizes, One Molecule, and the Enantiomer That Connects Them](https://ladasten.com/l-dopa-discovery-synthesis-two-nobel-prizes/): From Vicia faba to asymmetric hydrogenation: Carlsson, Hornykiewicz, Cotzias, Knowles, and why the D enantiomer had to be removed. - [Lidocaine's Discovery: An Amide Chosen to Delete a Metabolite, Not to Raise Potency](https://ladasten.com/lidocaine-discovery-first-amide-anaesthetic/): From barley mutants to 2,6-xylidine: the 1943 amide removed the PABA metabolite behind ester allergies, and the preservative restored it. - [Mebicar's Discovery: A Glycoluril Core Shared With Molecular Containers and Explosives](https://ladasten.com/mebicar-discovery-glycoluril-chemistry/): How tetramethylglycoluril became a Soviet anxiolytic, and why the same ring also gives cucurbiturils and polynitro explosives. Counted, not asserted. - [Methylene Blue: A Textile Dye, the First Synthetic Drug, and the Ancestor of Chlorpromazine](https://ladasten.com/methylene-blue-discovery-first-synthetic-drug/): Dye in 1876, antimalarial by 1891, ancestor of chlorpromazine. Which of those dates the bibliographic index can confirm, and which it cannot. - [Modafinil: The Metabolite That Displaced Its Own Parent Compound](https://ladasten.com/modafinil-discovery-synthesis-lafon-adrafinil/): Lafon 1974, Jouvet and Bastuji 1983, the Gulf in 1991 - and why the original synthesis is not indexed in PubMed at all. - [Noopept's Origin: A Dipeptide Drawn to Fit Piracetam's Ring, Not Found by Screening](https://ladasten.com/noopept-discovery-designed-dipeptide-analogue/): From a 1985 observation that piracetam competes with proline to a dipeptide prodrug of the endogenous peptide its own design predicted. - [PRL-8-53: The Compound Has Two Papers, Not One, and the First Is Not About Memory](https://ladasten.com/prl-8-53-discovery-hansl-two-papers/): The 1974 Experientia disclosure that PubMed queries miss, why the CAS number finds only the 1978 study, and what Hansl's three papers actually show. - [Sunifiram's Discovery: Molecular Simplification, No Patent, and a Market That Arrived Twelve Years Early](https://ladasten.com/sunifiram-discovery-synthesis-history/): How DM235 came out of a bicyclic series by molecular simplification in 2000, why no patent meant no toxicology, and why it is not structurally a racetam. - [Tadalafil: The Scaffold Was Chasing a Benzodiazepine Receptor Before It Found PDE5](https://ladasten.com/tadalafil-discovery-synthesis-beta-carboline-origin/): How a benzodiazepine-receptor lead became a PDE5 inhibitor, what a Pictet-Spengler leaves behind, and why the stereochemistry invites counterfeits.