This is a working overview of anti-doping, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-05-26. Anything still debated is marked as such rather than presented as settled.
At the molecular level, SR9009 binds REV-ERBα and REV-ERBβ and alters their repressive activity on target genes. These nuclear receptors help regulate the circadian clock, lipid synthesis, glucose metabolism, and inflammatory pathways. By changing transcription, the compound can shift the timing or magnitude of downstream metabolic processes in model systems. It does not act through androgen receptors or adenosine receptors, which distinguishes it from several substances sold for athletic performance. Whether the same transcriptional changes occur in humans at tolerable exposures remains an open question because controlled human studies are lacking.
Preclinical reports describe effects on exercise endurance, mitochondrial content, and lipid profiles in rodents, but these findings come from specific experimental conditions. Many studies use high doses or delivery methods that may not translate directly to human use. SR9009 has been reported to have low oral bioavailability and a short half-life, which complicates interpretation of oral dosing studies. It is not established as safe or effective for any indication. Literature discussions often separate its pharmacological mechanism from unverified claims made in fitness and supplement markets.
Detection of SR9009 in biological samples usually relies on liquid chromatography coupled to tandem mass spectrometry. This approach separates the compound from matrix components and identifies it by mass transitions. Because SR9009 can undergo metabolism, laboratories often look for both parent drug and specific metabolites. Sample preparation may involve protein precipitation or solid-phase extraction. Method validation examines sensitivity, carryover, and interference from related substances, and reference standards are required for accurate calibration.
Storage recommendations for SR9009 reference material typically specify a freezer at -20 °C or lower, with protection from moisture and light. Repeated freeze-thaw cycles can degrade small molecules and introduce variability. Stock solutions in dimethyl sulfoxide are often aliquoted to avoid repeated handling. Stability studies may examine degradation under heat, humidity, and light exposure. The compound's thiophene and nitro groups can participate in reactions that alter analytical signals over time, so such changes affect quantitative results.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C20H24ClN3O4S | Derived from published structure. |
| Molecular weight | 437.94 g/mol | Calculated value. |
| Appearance | White to off-white solid | Typical for purified research samples. |
| Solubility | DMSO, ethanol; low in water | Class: poorly water-soluble. |
| Typical storage | -20 °C, desiccated, protected from light | Limits degradation. |
Research interest in SR9009 grew from studies of circadian biology and metabolic disease. Preclinical reports describe effects on exercise capacity, muscle metabolism, and blood lipid levels in rodents, but these findings come from controlled laboratory settings. The compound has low oral bioavailability in animals, which limits systemic exposure after swallowing. Investigators often use injected routes in experiments to achieve measurable plasma concentrations. Human clinical data are sparse, no approved therapeutic product exists, and whether animal effects translate to humans remains an open question.
Regulatory and sporting contexts treat SR9009 as a prohibited substance in many elite competitions. Its presence on banned lists reflects concerns about performance enhancement and unknown long-term safety. Analytical chemists have developed methods to detect the parent compound and its metabolites in urine and blood. Literature discussions distinguish between in vitro potency, animal pharmacology, and anecdotal human reports. The latter are difficult to verify because products sold online may lack purity or contain different compounds.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. These receptors help regulate circadian rhythms, lipid metabolism, and inflammatory gene expression. In cell and animal experiments, SR9009 alters transcription of clock-controlled genes and metabolic pathways. The compound is not a hormone and does not resemble classical steroid structures. Its activity depends on binding to the ligand-binding domain of REV-ERB, where it can modify corepressor recruitment.
Handling recommendations for SR9009 in a laboratory setting include storing the solid at low temperature, protected from light and moisture. The compound is often dissolved in dimethyl sulfoxide or ethanol for experiments. Solutions should be prepared with appropriate personal protective equipment and disposed of according to local rules. Stability data for long-term storage are limited, so stock solutions are typically kept cold and used within defined periods. Records of preparation date and concentration support reproducibility.
SR9009 is not approved as a medicine by major regulatory agencies. It is commonly sold as a research chemical, a category that may fall outside customary drug approval and quality rules. In sports, the World Anti-Doping Agency lists SR9009 as a prohibited substance. Athletes who use it can face sanctions if it is detected in a sample. Legal status varies by country, and importation may be restricted. Enforcement practices differ across borders.
Detection of SR9009 in biological samples usually employs liquid chromatography coupled with tandem mass spectrometry. This method can identify the parent compound and sometimes metabolites in urine or blood. Because exposure can be low and clearance may be rapid, sample timing and limits of detection matter. Laboratories validate assays for sensitivity and specificity. Results are interpreted alongside chain-of-custody and quality-control records. Urine is the common matrix for anti-doping analysis, while blood may be used in research settings.
Pharmacokinetic data for SR9009 are limited in published literature. Some reports indicate low oral bioavailability and rapid clearance in animals, which complicates interpretation of exposure and effect. Researchers often use injected routes in preclinical work to achieve measurable systemic levels. Analytical studies rely on mass spectrometry to detect the parent compound and its metabolites. Questions about tissue distribution, active metabolites, and long-term consequences remain open. Species differences in metabolism can affect observed half-life and target engagement.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. These receptors help regulate circadian rhythms and metabolic gene expression. In laboratory experiments, SR9009 binds these receptors and alters transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. It is not a naturally occurring compound and has no approved therapeutic use. Research interest stems from its ability to modify energy metabolism in cells and animal models.
== Candidacy relating to elections of the German Federal president == At the 2010 election for the German Federal President, Kermani served as a member of the 14th Federal Assembly at the recommendation of the Green Party of Hessen. And in 2017, Kermani was mentioned as a potential candidate for German Federal President in that year's federal presidential election. According to a report in Der Spiegel, then-SPD chairman Sigmar Gabriel, in cooperation with other parties, had intended to nominate Kermani to run for Federal President. However, the plan failed due to resistance from the Greens. In particular, Kermani was rejected by the Realos wing of the Green Party, because the Realos were aiming to form a Black-Green coalition (i.e. a coalition with the Christian Democrats) subsequent to the general federal elections and thus did not want to be seen as endorsing a Red-Red-Green (i.e. Social Democratic, Left Party and Green Party) coalition.
=== Other conditions === Duchenne muscular dystrophy (DMD) is an X-linked disorder caused by defective production of dystrophin. Many jurisdictions around the world have screened for, or attempted to screen for DMD using elevated levels of creatine kinase measured in dried blood spots. Because universal newborn screening for DMD has not been undertaken, affected individuals often have a significant delay in diagnosis. As treatment options for DMD become more and more effective, interest in adding a newborn screening test increases. At various times since 1978, DMD has been included (often as a pilot study on a small subset of the population) in newborn screening programs in Edinburgh, Germany, Canada, France, Wales, Cyprus, Belgium and the United States. In 2012, Belgium was the only country that continued to screen for DMD using creatine kinase levels. As treatments improve, newborn screening becomes a possibility for disorders that could benefit from early intervention, but none was previously available. Adrenoleukodystrophy (ALD), a peroxisomal disease that has a variable clinical presentation is one of the disorders that has become a target for those seeking to identify patients early. ALD can present in several different forms, some of which do not present until adulthood, making it a difficult choice for countries to add to screening programs. The most successful treatment option is a stem cell transplant, a procedure that carries a significant risk.
Cartier Women's Initiative is an annual international entrepreneurship program created in 2006 by the French luxury goods maker Cartier (jeweler). The initiative aims to drive change by empowering women impact entrepreneurs. It is open to women led and owned business from any nation and sector that demonstrate a strong, sustainable social or environmental impact.
Sources: en.wikipedia.org
Under the doctrine of "positive non-interventionism", post-war administrations deliberately avoided direct resource allocation; active intervention was considered detrimental to economic growth. While the economy transitioned to a service basis during the 1980s, late colonial governments introduced interventionist policies. Post-handover administrations continued and expanded these programmes, including export-credit guarantees, a compulsory pension scheme, a minimum wage, anti-discrimination laws, and a state mortgage backer. In April 2026, Hong Kong's Securities and Futures Commission launched a regulatory framework to enable secondary trading of tokenised investment products on licensed virtual asset platforms, aiming to broaden retail investors' access to regulated digital asset trading services.
An ectomycorrhiza (from Ancient Greek ἐκτός (ektós) 'outside', μύκης (múkēs) 'fungus' and ῥίζα (rhíza) 'root'; abbreviated EcM; pl. ectomycorrhizae or ectomycorrhizas) is a form of symbiotic relationship that occurs between a fungal symbiont, or mycobiont, and the roots of various plant species. The mycobiont is often from the division Basidiomycota and Ascomycota, and more rarely from the Zygomycota. Ectomycorrhizae form on the roots of around 2% of plant species, usually woody plants, including species from the birch, dipterocarp, myrtle, beech, willow, pine and rose families. Research on ectomycorrhizae is increasingly important in areas such as ecosystem management and restoration, forestry, and agriculture. Unlike other mycorrhizal relationships, such as arbuscular mycorrhiza and ericoid mycorrhiza, ectomycorrhizal fungi do not penetrate their host's cell wall. Instead they form an entirely intercellular interfaces known as the Hartig net, consisting of highly branched hyphae forming a latticework between epidermal and cortical root cells. Ectomycorrhizas are further differentiated from other mycorrhizas by the formation of a dense hyphal sheath, known as the mantle, surrounding the root surface. This sheathing mantle can be up to 40 μm thick, with hyphae extending up to several centimeters into the surrounding soil. The hyphal network helps the plant to take up nutrients including water and minerals, often helping the host plant to survive adverse conditions. In exchange, the fungal symbiont is provided with access to carbohydrates.
== Plot == Nathan is currently in Switzerland, living as a nomad. He has been unsuccessfully searching for the Fairborn, a knife that can only be used by Nathan's bloodline. His friend, Gabriel, is missing. Nathan meets Nesbitt, who is half fain and half Black witch. When they are ambushed by Hunters, Nesbitt catches one, while the other, Kieran, Annalise's brother, turns invisible. It is then that Nathan feels the animal in him, and he kills Kieran. The next day, Nesbitt brings Nathan to Van, his employer. Van informs Nathan that Soul, Annalise's uncle, has taken charge of the Council of White Witches and is letting a witch named Wallend experiment on Black witches.
A change in the difference in isotopic composition of precipitation on the two sides of a mountain can be used to infer the magnitude of the rain shadow effect. In one such study, an isotope enrichment was observed in smectite on the east side of the Sierra Nevada in California from mid-Miocene to late Pliocene, suggesting a decrease in elevation during this period. Another study found δDs around −140‰ in muscovite in the North America Cordillera during the early Eocene, which would suggest an elevation 1km higher than today at the time. In addition to hydrous minerals, hydrogen isotopes in biomarkers such as leaf waxes have also been developed for paleoaltimetry studies. The δD lapse rate in leaf waxes (−21‰/km) falls in the range of meteoric water observations. As an example study, leaf wax δD data has been used to confirm hydrous mineral paleoaltimetry for the high elevation of the Sierra Nevada during the Eocene.
Sources: en.wikipedia.org
In chemistry and physics, cohesion (from Latin cohaesiō 'cohesion, unity'), also called cohesive attraction or cohesive force, is the action or property of like molecules sticking together, being mutually attractive. It is an intrinsic property of a substance that is caused by the shape and structure of its molecules, which makes the distribution of surrounding electrons irregular when molecules get close to one another, creating an electrical attraction that can maintain a macroscopic structure such as a water drop. Cohesion allows for surface tension, creating a "solid-like" state upon which light-weight or low-density materials can be placed. Water, for example, is strongly cohesive as each molecule may make four hydrogen bonds to other water molecules in a tetrahedral configuration. This results in a relatively strong Coulomb force between molecules. In simple terms, the polarity (a state in which a molecule is oppositely charged on its poles) of water molecules allows them to be attracted to each other. The polarity is due to the electronegativity of the atom of oxygen: oxygen is more electronegative than the atoms of hydrogen, so the electrons they share through the covalent bonds are more often close to oxygen rather than hydrogen. These are called polar covalent bonds, covalent bonds between atoms that thus become oppositely charged. In the case of a water molecule, the hydrogen atoms carry positive charges while the oxygen atom has a negative charge.
== Biology == The active vitamin D metabolite, calcitriol, exerts its biological effects by binding to the vitamin D receptor (VDR), which is primarily located in the nuclei of target cells. When calcitriol binds to the VDR, it enables the receptor to act as a transcription factor, modulating the gene expression of transport proteins involved in calcium absorption in the intestine, such as TRPV6 and calbindin. The VDR is part of the nuclear receptor superfamily of steroid hormone receptors, which are hormone-dependent regulators of gene expression. These receptors are expressed in cells across most organs. VDR expression decreases as age increases. Activation of VDR in the intestine, bone, kidney, and parathyroid gland cells is central to maintaining calcium and phosphorus levels in the blood, a process that is assisted by parathyroid hormone and calcitonin, thereby supporting bone health. VDR also regulates cell proliferation and differentiation. Additionally, vitamin D influences the immune system, with VDRs being expressed in several types of white blood cells, including monocytes and activated T and B cells.
== Chemistry == Volufralin is a semisynthetic analogue of limonoids from Neobeguea mahafalensis root bark such as libiguin A and libiguin B. Neobeguea mahafalensis has a long history of traditional use in Madagascar. In 2014, libiguin A and B were discovered via isolation from the roots of the plant and were found to cause "profound enhancement of sexual activity" in rodents. This specifically included having very high potency and a remarkably long-lasting duration in increasing mounting behavior in male rodents.
Fidelity of feedback responses between diverse cell types and the immune system depends on the integrity of mechanisms that limit the range of genes activated by NF-κB, allowing only expression of genes which contribute to an effective immune response and subsequently, a complete restoration of tissue function after resolution of inflammation. In cancer, mechanisms that regulate gene expression in response to inflammatory stimuli are altered to the point that a cell ceases to link its survival with the mechanisms that coordinate its phenotype and its function with the rest of the tissue. This is often evident in severely compromised regulation of NF-κB activity, which allows cancer cells to express abnormal cohorts of NF-κB target genes. This results in not only the cancer cells functioning abnormally: cells of surrounding tissue alter their function and cease to support the organism exclusively. Additionally, several types of cells in the microenvironment of cancer may change their phenotypes to support cancer growth. Inflammation, therefore, is a process that tests the fidelity of tissue components because the process that leads to tissue regeneration requires coordination of gene expression between diverse cell types.
When the recombinant MBP includes a signal peptide, the fusion protein can be exported into the periplasmic space, which facilitates its purification since the periplasmic fluid contains only a limited number of proteins and can be recovered either by an osmotic shock or by permeabilization of the bacterial outer membrane with antibiotics such as Polymyxin B. Such an export of the fusion protein into the periplasmic space enables the formation of disulfide bonds in the passenger protein, for example antibody fragments. Foreign proteins that are exported or secreted in their native organism, can usually be exported into the E. coli periplasm by fusion with MBP. Examples of cytoplasmic proteins that could be exported by fusion with MBP, include the monomeric Klenow polymerase and the dimeric Gene V protein of phage M13. When the recombinant MBP includes either a defective or no signal peptide the fusion protein remains within the bacterial cytoplasm from where it can be recovered by breaking open the cells. The fusion of proteins with MBP usually enhances their solubility and facilitates their proper folding so that the fusion proteins are most often bifunctional. In addition, such fusions can facilitate the crystallisation of difficult proteins, e.g. membrane proteins. The crystallized protein can often have their structures solved by X-ray crystallography using molecular replacement on a known MBP structure.
Sources: en.wikipedia.org
SR9009 is a synthetic REV-ERB agonist used in laboratory research. It is not an approved drug, and its effects in humans are not well characterized. It is often sold as a research chemical under the name Stenabolic.
No. SR9009 targets the nuclear receptors REV-ERBα and REV-ERBβ, not the androgen receptor. This mechanism differs from selective androgen receptor modulators and from exercise mimetics that act on PPARδ.
Published evidence is mainly preclinical, using cell cultures and animal models. Controlled human trials are not well documented in the public literature. Claims about human performance or health effects therefore remain unsupported by robust clinical data.
Liquid chromatography-tandem mass spectrometry is a common approach. It can detect the parent compound and its metabolites in biological matrices.