A practical reference on research chemical: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-02-12. Anything still debated is marked as such rather than presented as settled.
SR9009 is frequently discussed alongside other REV-ERB ligands, including synthetic agonists and natural heme-related molecules. Its selectivity for REV-ERB over related nuclear receptors has been measured in binding and reporter assays, though off-target activity at higher concentrations is possible. The compound is prohibited in sport by the World Anti-Doping Agency, and it is not approved for any medical use in major jurisdictions. Products sold online may be labeled as research chemicals, and their identity and purity are not guaranteed by regulatory review.
SR9009 is a synthetic small molecule that acts on the nuclear receptors REV-ERBα and REV-ERBβ. These receptors are part of the circadian clock machinery and normally repress transcription of certain target genes. In laboratory research, SR9009 is used as a chemical tool to study how REV-ERB activity influences metabolism, inflammation, and daily biological rhythms. The compound is not an approved medicine, and its effects in humans remain largely uncharacterized. It is often described as an investigational agent rather than a therapeutic product.
Analytical identification and purity assessment often use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Liquid chromatography–tandem mass spectrometry is used to detect and quantify SR9009 in biological matrices, including urine and blood, for anti-doping or pharmacokinetic studies. Nuclear magnetic resonance spectroscopy can confirm molecular structure. Stability depends on form and storage: the solid is generally more stable than solutions, and repeated freeze–thaw cycles may degrade samples. Purity is typically reported as a percentage from a certificate of analysis.
Regulatory treatment of SR9009 varies by country and context. It is not approved as a therapeutic drug by agencies such as the United States Food and Drug Administration or the European Medicines Agency. Sports authorities list it as a prohibited substance; the World Anti-Doping Agency classifies it among hormone and metabolic modulators. Legal status for personal possession or sale differs across jurisdictions, and some countries may restrict it under analog or research chemical laws. Buyers who seek verified material often rely on independent laboratory testing because online product labels may not match contents.
| Property | Value | Notes |
|---|---|---|
| Common name | SR9009 | Also marketed informally as Stenabolic |
| Chemical class | Synthetic REV-ERB agonist | Binds REV-ERBα and REV-ERBβ |
| Molecular formula | C24H30ClN3O4S | Approximate molecular weight 492 g/mol |
| CAS Registry Number | 1379686-30-2 | Identifier for the parent compound |
| Regulatory status | Not approved for human use | Prohibited in sport by WADA |
SR9009 is supplied as a solid research chemical, often in milligram quantities. Laboratories typically weigh it in a controlled environment because fine powders can disperse. Stock solutions are commonly prepared in dimethyl sulfoxide and stored in small aliquots to reduce freeze-thaw cycles. Personal protective equipment and chemical fume hoods are standard when handling unknown or potent compounds. These practices address laboratory safety rather than human use.
Identity and purity of SR9009 samples are usually checked with chromatographic and spectrometric methods. High-performance liquid chromatography can separate the compound from related impurities, while mass spectrometry provides molecular mass confirmation. Nuclear magnetic resonance spectroscopy may be used for structural verification in research settings. No single method proves biological activity, and certificates of analysis should be reviewed alongside raw data. Independent testing is often needed because online products vary widely.
SR9009 binds REV-ERB receptors and alters their repressive activity on target genes. This action can change transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. In rodent studies, treated animals have shown changes in muscle oxidative capacity and exercise performance, though effects vary by dose, duration, and model. The precise molecular steps connecting receptor binding to whole-body outcomes are still an active area of investigation. Findings in animals do not automatically translate to humans.
Because REV-ERB receptors are core clock components, SR9009 has been examined for effects on daily rhythms as well as metabolism. Research has explored whether the compound can shift or reinforce circadian gene expression in tissues such as liver and muscle. Some studies report improved metabolic markers in obese or diabetic mice, while others show context-dependent responses. Questions remain about which effects are direct, which are secondary to timing, and how they might differ across species.
SR9009 is a synthetic small molecule studied as an agonist of REV-ERB nuclear receptors. REV-ERB alpha and REV-ERB beta help regulate circadian rhythms and metabolic gene expression. In laboratory research, SR9009 has been used to probe how these receptors affect skeletal muscle, liver, and adipose tissue. The compound was identified in academic drug-discovery work and is often described in scientific literature by its chemical name and research code. It is not an approved medicine, and human clinical data remain limited or absent.
For long-term storage, SR9009 is typically kept as a solid at low temperature, protected from moisture and light. Desiccated conditions limit hydrolysis, while opaque containers reduce photochemical breakdown. Solutions are less stable than solids and are often stored frozen in aliquots to avoid repeated freeze-thaw cycles. Stability data are not standardized across all suppliers, so users should rely on certificate-of-analysis information when available. Degradation may appear as color change, precipitate, or decreased chromatographic purity.
Laboratory identification of SR9009 typically relies on chromatographic separation coupled to mass spectrometry, often with ultraviolet detection as a secondary check. Nuclear magnetic resonance spectroscopy can confirm molecular structure when a reference standard is available. Because many suppliers sell the compound as a research chemical, independent identity testing is important for experimental reproducibility. A single retention time is not sufficient proof of identity, especially when related compounds may be present. Purity assessments usually report a percentage based on area normalization.
SR9009 is generally described as poorly soluble in water and more soluble in organic solvents such as dimethyl sulfoxide and ethanol. Stock solutions are commonly prepared in an organic solvent before dilution into an aqueous buffer or vehicle. Precipitation can occur if the organic fraction is reduced too quickly or if the final concentration exceeds the compound's solubility limit. Sonication or gentle warming may aid dissolution in some protocols, but excessive heat can promote degradation. Container material and pH can also influence observed solubility.
REV-ERB proteins help regulate daily cycles in gene expression, including genes tied to lipid and glucose metabolism. SR9009 binds these receptors and alters their activity in cell and animal experiments. Consequences observed in rodents include changes in skeletal muscle oxidative capacity, blood lipid levels, and exercise performance. The precise chain from receptor occupancy to whole-body effects is still an active area of study. Human responses cannot be assumed from rodent data.
Most published work on SR9009 consists of preclinical studies. It is widely sold as a research chemical, a category that does not imply safety, efficacy, or pharmaceutical-grade quality. Sports anti-doping organizations have listed SR9009 as a prohibited substance, and its presence in an athlete sample can lead to sanctions. Legal status differs by country; in several jurisdictions it is not approved for human consumption and may be treated as an unapproved new drug.
== Function == Prohormones allow for transport and storage of usually-active proteins as inactive peptide chains, though they are much more commonly found in nature as a stable intermediate in the protein-synthesizing process of the cell. Proinsulin, for example, is seen in nature as a brief precursor to insulin, as it is produced on the ribosomes of the cell, transported to the Golgi apparatus as proinsulin, then is converted to insulin immediately after reaching the Golgi apparatus. It is also primarily stored as insulin. However, other inactive proteins travel in their prohormone form, such as vitamin D, also known as calciferol, which can be produced by the human body via sunlight. The main regulator of prohormone to hormone conversion is prohormone convertase. Located in the Golgi apparatus, it uses endoproteolytic cleavage to separate peptide hormones from each other and removes extended amino acid residues that hinder the inactive peptides from being active proteins. Because of this role, prohormone convertase is one of the deciding factors for regulation of hormone content in the body, as it has the ability to change an inactive protein with unsubstantial hormonal effect on the body, to a fully active protein with a meaningful hormonal effect. For peptide hormones, the conversion process from prohormone to hormone (pro-protein to protein) typically occurs after being exported to the endoplasmic reticulum and often requires multiple processing enzymes.
=== Ring-fused pyridines === Benzopyridine, quinoline, is a component of coal tars. It and its derivatives find many uses. Dibenzopyridines are also well known, the symmetrical version being acridine.
Peritenon (from peri-: around, tenon: tendon) is the connective tissue sheath surrounding a tendon. Inflammation of a peritenon is called "peritendinitis" or "peritenonitis". Although Achilles tendon has no synovial sheath, it has a peritenon instead which has the same function.
==== Aplastic crisis ==== Aplastic crises are instances of an acute worsening of the patient's baseline anaemia, producing pale appearance, fast heart rate, and fatigue. This crisis is normally triggered by parvovirus B19, which directly affects production of red blood cells by invading the red cell precursors and multiplying in and destroying them. Parvovirus infection almost completely prevents red blood cell production for two to three days (red cell aplasia). In normal individuals, this is of little consequence, but the shortened red cell life of people with sickle cell disease results in an abrupt, life-threatening situation. Reticulocyte count drops dramatically during the disease (causing reticulocytopenia), red cell production lapses, and the rapid destruction of existing red cells leads to acute and severe anaemia. This crisis takes four to seven days to resolve. Most patients can be managed supportively; some need a blood transfusion.
Sources: en.wikipedia.org
=== Early student activism: 1966–1968 === Biko was initially interested in studying law at university, but many of those around him discouraged this, believing that law was too closely intertwined with political activism. Instead they convinced him to choose medicine, a subject thought to have better career prospects. He secured a scholarship, and in 1966 entered the University of Natal Medical School. There, he joined what his biographer Xolela Mangcu called "a peculiarly sophisticated and cosmopolitan group of students" from across South Africa; many of them later held prominent roles in the post-apartheid era. The late 1960s was the heyday of radical student politics across the world, as reflected in the protests of 1968, and Biko was eager to involve himself in this environment. Soon after he arrived at the university, he was elected to the Students' Representative Council (SRC). The university's SRC was affiliated with the National Union of South African Students (NUSAS). NUSAS had taken pains to cultivate a multi-racial membership but remained white-dominated because the majority of South Africa's students were from the country's white minority. As Clive Nettleton, a white NUSAS leader, put it: "the essence of the matter is that NUSAS was founded on white initiative, is financed by white money and reflects the opinions of the majority of its members who are white". NUSAS officially opposed apartheid, but it moderated its opposition in order to maintain the support of conservative white students.
=== Identification of immunogenic subunit === Candidate subunits will be selected primarily by their immunogenicity. To be immunogenic, they should be of foreign nature and of sufficient complexity for the reaction between different components of the immune system and the candidates to occur. Candidates are also selected based on size, nature of function (e.g. signalling) and cellular location (e.g. transmembrane).
Boehringer Ingelheim Austria has validated a method with cGMP (commercial good manufacturing practices) for production of pharmaceutical-grade DNA plasmids. They are able to process 200L of fermentation broth on an 800mL monolith. At BIA Separations, processing time of the tomato mosaic virus decreased considerably from the standard five days of manually intensive work to equivalent purity and better recovery in only two hours with a monolith column. Other viruses have been purified on monoliths as well. Affinity monoliths have also been applied to the isolation of nanoscale particles from human plasma. Tandem monolithic disks functionalized with chondroitin-6-sulfate and anti-apolipoprotein B-100 antibodies enabled the selective isolation of low-density lipoprotein in less than 30 minutes, while a monolith carrying an anti-CD61 antibody isolated platelet-derived extracellular vesicles in 19 minutes. Monolithic disks carrying antibodies against apoB-100, CD9, or CD61 were subsequently coupled online to asymmetric flow field-flow fractionation, allowing automated isolation and size fractionation of lipoproteins and extracellular-vesicle subpopulations. Extracellular-vesicle fractions obtained using these monolith-based systems have also been characterized by Raman spectroscopy and comprehensive two-dimensional gas chromatography, and used in quartz crystal microbalance studies of binding between extracellular-vesicle subpopulations and affinity ligands.
Sources: en.wikipedia.org
He later developed the idea that humans possess a mutated form of the l-gulonolactone oxidase coding gene. Stone introduced Linus Pauling to the theory that humans needed to consume vitamin C in quantities far higher than what was considered a recommended daily intake in order to optimize health. In 2008, researchers discovered that in humans and other primates the red blood cells have evolved a mechanism to more efficiently use the vitamin C present in the body by recycling oxidized l-dehydroascorbic acid (DHA) back into ascorbic acid for reuse by the body. The mechanism was not found to be present in mammals that synthesize their own vitamin C.
SSRIs can also induce apoptosis, programmed cell death, in T-cells. The full mechanism of action for the anti-inflammatory effects of SSRIs is not fully known. However, there is evidence for various pathways to have a hand in the mechanism. One such possible mechanism is the increased levels of cyclic adenosine monophosphate (cAMP) as a result of interference with activation of protein kinase A (PKA), a cAMP-dependent protein. Other possible pathways include interference with calcium ion channels, or inducing cell death pathways like MAPK and Notch signaling pathway. The anti-inflammatory effects of SSRIs have prompted studies of the efficacy of SSRIs in the treatment of autoimmune diseases such as multiple sclerosis, RA, inflammatory bowel diseases, and septic shock. These studies have been performed in animal models but have shown consistent immune regulatory effects. Fluoxetine, an SSRI, has also shown efficacy in animal models of graft vs. host disease. SSRIs have also been used successfully as pain relievers in patients undergoing oncology treatment. The effectiveness of this has been hypothesized to be at least in part due to the anti-inflammatory effects of SSRIs.
Acellular dermis is a type of biomaterial derived from processing human or animal tissues to remove cells and retain portions of the extracellular matrix (ECM). These materials are typically cell-free, distinguishing them from classical allografts and xenografts, can be integrated or incorporated into the body, and have been FDA approved for human use for more than 10 years in a wide range of clinical indications.
=== Amino acid composition === Plant OTCs have the largest difference from other OTCs. There are 50 to 70% less Leu residues, while there are twice as many Arg residues. The number of subunits in OTCs vary from 322 to 340 residues. Animals have the highest density of Leu. This residue breakdown causes a pI for the animal enzyme of 6.8 while the plant enzyme has a pI of 7.6. Rat, bovine, and human OTC have the same C terminal residue of phenylalanine. Their N-terminal residues on the other hand differ. Rat ends with Ser, bovine with aspartate, and human with glycine.
Sources: en.wikipedia.org
SR9009 is a synthetic research compound that binds and modulates the nuclear receptors REV-ERBα and REV-ERBβ. It is used in laboratory studies of circadian biology and metabolism, not as an approved medicine. It is also known by the informal name Stenabolic.
No. SR9009 has not been approved as a therapeutic drug in the United States, European Union, or other major markets. Human safety and efficacy data are very limited. Its presence in consumer products does not imply regulatory approval.
The World Anti-Doping Agency lists SR9009 as a prohibited substance because it can alter gene expression and metabolic pathways relevant to performance. The ban applies at all times, not only during competition. Detection relies on laboratory methods such as mass spectrometry.
Legality depends on the country and the intended use. In many places it is sold as a research chemical, but sports and medicine regulations restrict it.