LC-MS/MS raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-08-22 and is reviewed periodically as new material appears.
At the molecular level, SR9009 binds the ligand-binding domain of REV-ERB and strengthens recruitment of corepressor proteins such as NCoR and HDAC3. This increases repression of target genes, including Bmal1 and other clock-controlled and metabolic genes. In rodent studies, such changes have been linked to altered lipid handling, glucose metabolism, and energy expenditure. The precise chain of events between receptor binding and whole-body effects remains an active area of research. Findings in animals do not automatically translate to humans.
Laboratory studies often administer SR9009 by injection because oral absorption appears poor in rodents. Reported pharmacokinetic properties include rapid metabolism and low systemic exposure after oral dosing. Human pharmacokinetic data are sparse, so absorption, distribution, metabolism, and excretion in people are not well defined. Some research explores related REV-ERB compounds with improved drug-like properties. Regulatory approval for any REV-ERB agonist as a human medicine has not been granted to date.
Laboratory samples of SR9009 are typically supplied as a white to off-white powder. The compound dissolves readily in organic solvents such as dimethyl sulfoxide and ethanol, while its solubility in water is low. Because of this solubility profile, researchers often prepare concentrated stock solutions in an organic solvent before diluting them into aqueous assay buffers. Light exposure, moisture, and repeated freeze-thaw cycles can degrade many small molecules, so handling procedures usually aim to minimize these factors. Purity is commonly checked before use.
Storage conditions for research-grade SR9009 generally involve a freezer at approximately minus twenty degrees Celsius, sometimes lower for long-term preservation. Containers should remain tightly closed and protected from light. Desiccants may be used to limit moisture uptake. Solutions are often stored in aliquots to avoid repeated warming and cooling. Stability data for the compound under various conditions are limited, so laboratories typically follow supplier recommendations and verify performance through periodic analytical checks rather than assuming indefinite stability.
Identity and purity testing for SR9009 commonly uses liquid chromatography coupled with tandem mass spectrometry. This method separates the compound from matrix components and detects it by mass-to-charge transitions, providing sensitive and specific confirmation. Nuclear magnetic resonance spectroscopy can support structural identification, while high-performance liquid chromatography with ultraviolet detection may estimate purity. Because online products labeled as SR9009 may contain other substances or no active compound at all, independent verification is important in research settings. Certificates of analysis are useful but not a substitute for in-house testing.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic small molecule | Studied as a REV-ERB agonist |
| Molecular formula | C20H24ClN3O4S | Reported for the neutral compound |
| Appearance | Off-white to pale yellow solid | Typical research-grade material |
| Solubility | Sparingly soluble in water | Soluble in solvents such as DMSO |
| Common synonyms | SR9009; Stenabolic | Stenabolic is an informal alias |
Stability depends on physical form, temperature, light exposure, and solvent. Solid SR9009 is generally stored cold and dry, with protection from light to limit degradation. Dimethyl sulfoxide stocks are common for laboratory work, but repeated freeze-thaw cycles can reduce compound integrity. Aqueous solutions may be less stable than organic stocks, and the ethyl ester in the structure can be susceptible to hydrolysis under certain conditions. Researchers typically validate storage conditions and recheck purity before quantitative experiments, especially when using archived material.
Regulatory treatment of SR9009 varies by country and region. It is not approved as a pharmaceutical, and several jurisdictions restrict its sale for human consumption. Some authorities classify it as a research chemical, a prescription-only substance, or a prohibited performance-enhancing agent in sport. Purchasers may encounter certificates of analysis, but these documents do not guarantee identity, purity, or legality. In research settings, institutional safety reviews and controlled procurement help ensure that materials are handled under appropriate oversight. The absence of harmonized rules means that legal status can change and requires verification.
Analytical identification of SR9009 typically relies on liquid chromatography coupled with tandem mass spectrometry. In biological samples, researchers first separate the compound from matrix components using protein precipitation, liquid-liquid extraction, or solid-phase extraction. High-performance liquid chromatography with ultraviolet detection and nuclear magnetic resonance spectroscopy can support structural confirmation of reference materials. Because SR9009 is a small, relatively lipophilic molecule, reverse-phase columns and acidic mobile phases are common. Laboratories often include isotope-labeled internal standards to improve quantification and to correct for ion suppression.
Birch bark tar use as an adhesive began in the Middle Paleolithic. Neanderthals produced tar through dry distillation of birch bark as early as 200,000 years ago. A 2019 study demonstrated that birch bark tar production can be a simpler, more discoverable process by directly burning birch bark under overhanging stone surfaces in open-air conditions. However, at Königsaue (Germany), Neanderthals did not make tar with this method but rather employed a technically more demanding underground production method. A find from the Dutch North Sea and two tools from the Italian site Campitello show that Neanderthals used birch bark tar as a backing on small 'domestic' stone tools. Birch bark tar also has been used as a disinfectant, in leather dressing, and in medicine. A piece of 5,000-year-old chewing gum made from birch bark tar, and still bearing tooth imprints, was found in Kierikki, Finland. Genetic material left in the gum enabled novel research to identify population movements, types of food consumed, and types of oral bacteria found on their teeth. A different chewing gum sample, dated to 5,700 years old, was found in southern Denmark. A complete human genome and oral microbiome was sequenced from chewed birch bark tar. Researchers identified that the individual who chewed the gum was a female who was closely related genetically to hunter-gatherers from mainland Europe. Fletching on arrows were fastened with birch bark tar, and rawhide lashing and birch bark tar were used to fix axe blades in the Mesolithic period.
The U.S. Food and Drug Administration noted in 2007 that fruit and vegetable-related outbreaks of food poisoning are on the rise and had struck in spinach, tomatoes, lettuce and cantaloupes. The agency urged fruit and vegetable processors to adopt food safety plans similar to those in the meat industry. An outbreak of Salmonella Saintpaul in 2008 was characterized by the US Center for Disease Control as the largest foodborne outbreak in a decade. Some 1304 infected persons were identified in 43 states, at least 252 were hospitalized and two deaths were possibly linked to the outbreak. CDC noted that the trace back of fresh produce, such as tomatoes, through the supply chain could be very difficult and labor-intensive. Ironically, the carrier item was ultimately determined to be jalapeño peppers, not tomatoes.
=== Folklore === "Living water" features in Germanic and Slavic folktales as a means of bringing the dead back to life. Note the Grimm fairy-tale ("The Water of Life") and the Russian dichotomy of living and dead water. The Fountain of Youth represents a related concept of magical waters allegedly preventing aging.
Sources: en.wikipedia.org
Adamantane (C10H16) Iceane (C12H18) BC-8 (C14H20) Diamantane (C14H20) also diadamantane, two face-fused cages Triamantane (C18H24), also triadamantane. Diamantane has four identical faces available for anchoring a new C4H4 unit. Isotetramantane (C22H28). Triamantane has eight faces on to which a new C4H4 unit can be added resulting in four isomers. One of these isomers displays a helical twist and is therefore prochiral. The P and M enantiomers have been separated. Pentamantane has nine isomers with chemical formula C26H32 and one more pentamantane exists with chemical formula C25H30 Cyclohexamantane (C26H30) Super-adamantane (C30H36) One tetramantane isomer is the largest ever diamondoid prepared by organic synthesis using a keto-carbenoid reaction to attach cyclopentane rings. Longer diamondoids have been formed from diamantane dicarboxylic acid. The first-ever isolation of a wide range of diamondoids from petroleum took place in the following steps: a vacuum distillation above 345 °C, the equivalent atmospheric boiling point, then pyrolysis at 400 to 450 °C in order to remove all non-diamondoid compounds (diamondoids are thermodynamically very stable and will survive this pyrolysis) and then a series of high-performance liquid chromatography separation techniques. In one study a tetramantane compound is fitted with thiol groups at the bridgehead positions. This allows their anchorage to a gold surface and formation of self-assembled monolayers (diamond-on-gold). Organic chemistry of diamondoids even extends to pentamantane.
The district's borders, which correspond to the former city's borders, are: Victoria Park Avenue (facing the rest of Toronto) to the west, the Rouge River, the Little Rouge Creek and the Scarborough-Pickering Townline (facing Pickering) to the east, Steeles Avenue (facing Markham) to the north, and Lake Ontario to the south. Topographically, the district is dominated by two watersheds, Highland Creek and the Rouge River. Highland Creek lies almost entirely within Scarborough and occupies approximately 70% of its total area. It occupies the western half of Scarborough, while the Rouge River flows through the eastern portion. Both of these rivers flow into Lake Ontario. Due to the location of the Lakeshore CN railway right-of-way, both river deltas are constricted to narrow channels where they flow into the lake. Highland Creek is the most urbanized watershed in Toronto with about 85% of its land use devoted to urban uses. Some sections of the river run through parks and remain in a fairly natural state, while other parts run through industrial or residential districts where the flow is often diverted or channelled. Sections of the creek are marked by deep ravines and valleys, which contain little or no urban development. The deep valley the creek cuts in its bottom sections remains primarily parkland, with little or no development taking place within the valley. Conversely, the Rouge River valley has parts which are still in a natural, wooded state.
== Standard, ensign and coat of arms == After the personal union with the United Kingdom ended in 1837 with the accession of Queen Victoria, Hanover kept the British royal arms and standard, only introducing a new Crown, after the British model. The centre of this coat of arms and royal standard included the original arms of Hanover, which consisted of the two lions of the Brunswick, the rampant lion with hearts of Lüneburg and the horse of Hanover, surmounted by the Imperial Crown of the Holy Roman Empire for the Holy Roman office of Archbannerbearer/Archtreasurer. As Hanover was no longer ruled by the British monarchs, the arms of Hanover were simultaneously removed from the British coat of arms and royal standard, so it was no longer identical with that of the Kingdom of Hanover.
Thionyl chloride is a component of lithium–thionyl chloride batteries, where it acts as both the electrolyte and the positive electrode (in batteries: cathode) with lithium forming the negative electrode (anode). The overall discharge reaction is as follows:
Sources: en.wikipedia.org
Higher chemical stability (crucial for biomedical applications) Narrow size distribution (crucial for biomedical applications) Higher colloidal stability since they do not magnetically agglomerate Magnetic moment can be tuned with the nanoparticle cluster size Retained superparamagnetic properties (independent of the nanoparticle cluster size) Silica surface enables straightforward covalent functionalization Magnetic nanoparticals have also be coated with a molecularly imprinted polymer which adds a specific recognition element to the particles, enabling them to be used to specifically capture target molecules of interest.
Around thirty plant species are known to contain caffeine. Common sources are the "beans" (seeds) of the two cultivated coffee plants, Coffea arabica and Coffea canephora (the quantity varies, but 1.3% is a typical value); and of the cocoa plant, Theobroma cacao; the leaves of the tea plant; and kola nuts. Other sources include the leaves of yaupon holly, South American holly yerba mate, and Amazonian holly guayusa; and seeds from Amazonian maple guarana berries. Temperate climates around the world have produced unrelated caffeine-containing plants. Caffeine in plants acts as a natural pesticide: it can paralyze and kill predator insects feeding on the plant. High caffeine levels are found in coffee seedlings when they are developing foliage and lack mechanical protection. In addition, high caffeine levels are found in the surrounding soil of coffee seedlings, which inhibits seed germination of nearby coffee seedlings, thus giving seedlings with the highest caffeine levels fewer competitors for existing resources for survival. Caffeine is stored in tea leaves in two places. Firstly, in the cell vacuoles where it is complexed with polyphenols. This caffeine probably is released into the mouth parts of insects, to discourage herbivory. Secondly, around the vascular bundles, where it probably inhibits pathogenic fungi from entering and colonizing the vascular bundles. Caffeine in nectar may improve the reproductive success of the pollen producing plants by enhancing the reward memory of pollinators, such as honey bees.
=== Pharmacokinetics === The bioavailability of mianserin is 20 to 30%. Its plasma protein binding is 95%. Mianserin is metabolized in the liver by the CYP2D6 enzyme via N-oxidation and N-demethylation. Its elimination half-life is 21 to 61 hours. The drug is excreted 4 to 7% in the urine and 14 to 28% in feces.
Sources: en.wikipedia.org
SR9009 is a synthetic research compound that activates the REV-ERBα and REV-ERBβ nuclear receptors. It is not an approved drug and has no established human therapeutic use. Most published biological data come from cell and rodent studies.
No. SR9009 is frequently mislabeled as a SARM in online discussions, but it does not target androgen receptors. Its known mechanism involves REV-ERB nuclear receptors and circadian-metabolic gene regulation.
Human clinical data are very limited. There is no approved human use, and safety and efficacy in people are not established. Most evidence comes from preclinical models, so effects observed in animals may not apply to humans.
Research-grade SR9009 is typically stored frozen at about minus twenty degrees Celsius, protected from light and moisture. Stock solutions are often kept in aliquots to avoid repeated freeze-thaw cycles. Specific storage conditions should follow the supplier's documentation.