SR9009 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 2025-08-14 and is reviewed periodically as new material appears.
Research interest in SR9009 grew from studies showing improved running endurance in mice after short treatment periods. Those experiments linked the compound to increased mitochondrial content and fatty acid oxidation in muscle, but the findings come from animal models and specific dosing schedules. Independent replication has been limited, and the pathways connecting REV-ERB activation to exercise performance are still being mapped. Whether similar responses occur in humans is an open question.
SR9009 is often grouped with compounds studied for circadian and metabolic regulation rather than with classical anabolic steroids. Its interactions with nuclear receptors differ from those of androgen receptor ligands, and its proposed mechanisms involve transcriptional control rather than direct hormone signaling. Some sources classify it as a metabolic modulator because of observed effects on energy utilization. The distinction matters for regulation and for interpreting research results across different compound classes.
Scientific discussion of SR9009 often separates animal evidence from human anecdote. Rodent studies provide controlled data on endurance, metabolism, and gene expression, but they use specific strains, doses, and treatment durations. Human reports are mostly uncontrolled and cannot establish cause and effect. Open questions include oral bioavailability, tissue distribution, metabolic stability, and long-term effects. Review articles generally call for more rigorous pharmacokinetic and safety research before any clinical use could be considered.
Analytical methods for SR9009 typically rely on liquid chromatography coupled with tandem mass spectrometry. The technique can separate the parent compound from related substances and detect low concentrations in biological matrices. Urine and blood are common samples in anti-doping testing, while in vitro studies may use cell culture media. Rapid metabolism and low expected concentrations make method validation important for reliable identification. Exact metabolite patterns can vary by species and are not fully mapped.
Regulatory treatment of SR9009 reflects its investigational status. The compound has no approved human therapeutic indication, and sports authorities prohibit its use. It appears on anti-doping lists as a non-approved substance or metabolic modulator, depending on the list version. Products sold online as research chemicals are not quality-controlled medicines, so their identity and purity can differ from the label. Such products may also contain unlisted compounds, which complicates both testing and safety assessment.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C20H24ClN3O4S | Reported for the free base |
| Molecular weight | 437.9 g/mol | Calculated from the formula |
| Primary target | REV-ERBα and REV-ERBβ | Nuclear receptors involved in circadian regulation |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water |
| Typical storage | -20 °C, desiccated | Protect from light and moisture |
Mechanistically, SR9009 binds the ligand-binding domain of REV-ERBα/β and enhances recruitment of corepressor complexes. This represses target genes rather than activating them. Because REV-ERB proteins normally compete with ROR proteins at shared response elements, the net effect depends on tissue and timing. Researchers use SR9009 to probe how nuclear receptor signaling links the clock to metabolism, inflammation, and muscle biology. Findings are largely preclinical, and the precise contribution of each receptor subtype remains under study.
SR9009 is frequently discussed in fitness and research-chemical contexts, yet it has no approved medical indication. Regulatory agencies have not authorized it for human use, and it is not a standard prescription drug. Some sports organizations list it as a prohibited substance because of its potential performance-enhancing properties. Published human data are sparse, so claims about its effects in people often rely on animal models or anecdotal reports. Quality and identity of online materials can vary widely.
Detection in biological samples can be complicated by rapid metabolism and low circulating concentrations. Some studies report phase I and phase II metabolites, and analytical methods may need to target those species in addition to the parent compound. Immunoassays are not broadly available, so mass spectrometry remains the main confirmatory approach. For anti-doping testing, laboratories look for SR9009 and its metabolites using validated LC-MS methods. Open questions include how long metabolites remain detectable and how different routes of administration alter detection windows.
In laboratory settings, SR9009 is typically characterized by liquid chromatography–mass spectrometry (LC-MS) or high-performance liquid chromatography with ultraviolet detection (HPLC-UV). These methods can confirm identity and estimate purity, but they require reference standards for accurate quantification. Because SR9009 is not a licensed pharmaceutical, no harmonized pharmacopeial monograph exists. Laboratories often validate in-house methods for matrices such as plasma, urine, or cell culture media. Sample preparation may involve protein precipitation or liquid-liquid extraction before analysis.
=== Muscle involvement === Diagnosing MCTD involves identification of inflammatory myopathy that is histologically and clinically identical to polymyositis (PM). The majority of persons with MCTD do not experience clinical weakness. People with MCTD typically have mild myositis, with normal muscle enzymes and electromyographic results. Some people may be completely asymptomatic. Myositis can be severe and difficult to differentiate from conventional dermatomyositis. Myalgia is a prevalent complaint among patients with MCTD.
In enzymology, creatinase (EC 3.5.3.3), also known as creatine amidinohydrolase, is classified as a hydrolase enzyme, acting on carbon-nitrogen bonds in linear amidines. Specifically, this enzyme breaks the amidino C-N bond in creatine, producing sarcosine and urea. Creatinase activity has been described in several bacteria species, most notably Pseudomonas putida, where the enzyme plays a key role in the metabolism of creatine as a nitrogen and carbon source.
The British policy as stated in the declaration was to face numerous challenges to its implementation in the following years. The first of these was the indirect peace negotiations which took place between Britain and the Ottomans in December 1917 and January 1918 during a pause in the hostilities for the rainy season; although these peace talks were unsuccessful, archival records suggest that key members of the War Cabinet may have been willing to permit leaving Palestine under nominal Turkish sovereignty as part of an overall deal. In October 1919, almost a year after the end of the war, Lord Curzon succeeded Balfour as Foreign Secretary. Curzon had been a member of the 1917 Cabinet that had approved the declaration, and according to British historian Sir David Gilmour, Curzon had been "the only senior figure in the British government at the time who foresaw that its policy would lead to decades of Arab–Jewish hostility". He therefore determined to pursue a policy in line with its "narrower and more prudent rather than the wider interpretation". Following Bonar Law's appointment as Prime Minister in late 1922, Curzon wrote to Law that he regarded the declaration as "the worst" of Britain's Middle East commitments and "a striking contradiction of our publicly declared principles". In August 1920 the report of the Palin Commission, the first in a long line of British Commissions of Inquiry on the question of Palestine during the Mandate period, noted that "The Balfour Declaration ... is undoubtedly the starting point of the whole trouble".
=== αvβ6-integrin target === The abundance of αvβ6-integrin on most adult human cell types and respective tissues is low. It is however overexpressed in the context of several medical conditions, such as cancer or fibrosis, particularly idiopathic pulmonary fibrosis. In line with the finding that αvβ6-integrin is expressed by epithelial cells, an elevated density of the protein is observed on the cell surfaces of many carcinomas (synonymous to cancers of epithelial origin). Hence, 68Ga-Trivehexin can be used for PET imaging of αvβ6-integrin positive cancers (i.e., those whose cells possess a sufficiently high density of αvβ6 on their surface), including but not limited to pancreatic ductal adenocarcinoma, non-small cell lung cancer, squamous cell carcinomas (SCC) of different origin (most notably, oral and esophageal SCC), as well as breast, ovarian, and bladder cancer. In colorectal cancer, expression of αvβ6-integrin is higher in the more aggressive forms and correlated with reduced overall survival. 68Ga-Trivehexin has a high binding affinity to αvβ6-integrin (IC50 = 0.047 nM). Its affinity to other RGD-binding integrins is much lower (IC50 for αvβ3, αvβ8, and α5β1 are 2.7, 6.2, and 22 nM, respectively; note that for IC50, higher values mean lower affinity), resulting in a high selectivity for αvβ6-integrin.
=== September === 17 September – President Lula signs a decree to increase the benefits of the Bolsa Familia program by 15%. 20 September – The Superior Electoral Court rejects a petition to extend voting time amidst Simchat Torah, which falls on 4 October, the day of the nation's first round of elections. 21 September – A helicopter crashes in Santa Catarina, killing all five people on board including singer Rick Sollo. 25 September – President Lula issues a provisional order banning online gambling and sports betting.
Sources: en.wikipedia.org
Ancient habitation areas, longhouses, crop terraces, roads as the Inca road system, cemeteries, hypogeums and necropolises are all part of the architectural heritage of indigenous peoples. Some prominent indigenous structures are the preceramic and ceramic archaeological site of Tequendama, Tierradentro (a park that contains the largest concentration of pre-Columbian monumental shaft tombs with side chambers), the largest collection of religious monuments and megalithic sculptures in South America, located in San Agustín, Huila, Lost city (an archaeological site with a series of terraces carved into the mountainside, a net of tiled roads, and several circular plazas), and the large villages mainly built with stone, wood, cane, and mud. Architecture during the period of conquest and colonization is mainly derived of adapting European styles to local conditions, and Spanish influence, especially Andalusian and Extremaduran, can be easily seen. When Europeans founded cities two things were making simultaneously: the dimensioning of geometrical space (town square, street), and the location of a tangible point of orientation. The construction of forts was common throughout the Caribbean and in some cities of the interior, because of the dangers posed to Spanish colonial settlements from English, French and Dutch pirates and hostile indigenous groups. Churches, chapels, schools, and hospitals belonging to religious orders have a great urban influence. Baroque architecture is used in military buildings and public spaces.
Ozarelix (developmental code names D-63153, SPI-153) is a peptide gonadotropin-releasing hormone antagonist (GnRH antagonist) which is or was under development by AEterna Zentaris Inc. and Spectrum Pharmaceuticals as a long-acting injection formulation for the treatment of prostate cancer. It has also been investigated for the treatment of endometriosis, but no development has been reported. The drug was previously under investigation for the treatment of benign prostatic hyperplasia and Alzheimer's disease as well, but development for these indications was discontinued. As of June 2015, it was in phase II clinical trials for prostate cancer. It seems to no longer be under development.
== Discovery == The protein was first isolated in 1987 by Thomas J. Martin's team at the University of Melbourne. Miao et al. showed that disruption of the PTHrP gene in mice caused a lethal phenotype and distinct bone abnormalities, suggesting that PTHrP has a physiological function.
== Early life and education == Stansbury was born in Farmington, New Mexico, and raised in Albuquerque. After graduating from Cibola High School in 1997, she received a Bachelor of Arts degree in human ecology and natural science from Saint Mary's College of California in 2002. She then received a Master of Science degree in development sociology with a minor in American Indian studies from Cornell University in 2007, where she was a PhD candidate.
Sources: en.wikipedia.org
=== The Flory convention === see Flory convention for details. In modeling the position vectors of atoms in macromolecules it is often necessary to convert from Cartesian coordinates (x,y,z) to generalized coordinates. The Flory convention for defining the variables involved is usually employed. For an example, a peptide bond can be described by the x,y,z positions of every atom in this bond or the Flory convention can be used. Here one must know the bond lengths
=== Purge and trap GC–MS === For the analysis of volatile compounds, a purge and trap (P&T) concentrator system may be used to introduce samples. The target analytes are extracted by mixing the sample with water and purge with inert gas (e.g. Nitrogen gas) into an airtight chamber, this is known as purging or sparging. The volatile compounds move into the headspace above the water and are drawn along a pressure gradient (caused by the introduction of the purge gas) out of the chamber. The volatile compounds are drawn along a heated line onto a 'trap'. The trap is a column of adsorbent material at ambient temperature that holds the compounds by returning them to the liquid phase. The trap is then heated and the sample compounds are introduced to the GC–MS column via a volatiles interface, which is a split inlet system. P&T GC–MS is particularly suited to volatile organic compounds (VOCs) and BTEX compounds (aromatic compounds associated with petroleum). A faster alternative is the "purge-closed loop" system. In this system the inert gas is bubbled through the water until the concentrations of organic compounds in the vapor phase are at equilibrium with concentrations in the aqueous phase. The gas phase is then analysed directly.
=== Excipients === Excipients are materials inert to the drug, which are added into dosage forms to improve the overall quality of the dosage form. Some examples include antioxidants, sweetening agents, stabilizers, dispersing agents, penetration enhancers, buffers and preservatives. Penetration enhancers are excipients that can increase skin permeability. Many classes of excipients can be used as penetration enhancers, such as glycerin, sulfoxides and related analogues, pyrrolidines, fatty acid and ethanol, surfactants etc. Buffers can be added to control the pH of aqueous or hydroalcoholic based gels. Examples of buffers include phosphate and citrate.
Statistics about profits from the drug trade are largely unknown and speculative due to its illicit nature. An online report published by the UK Home Office in 2007 estimated the illicit drug market in the UK at £4–6.6 billion a year.
This prevents BioBricks from being used to create fusion proteins, as the 6bp scar sequence codes for a tyrosine and a stop codon, causing translation to be terminated after the first domain is expressed, while the 8bp scar sequence causes a frameshift, preventing continuous readthrough of the codons. To offer alternative scar sequences that for example give a 6bp scar, or scar sequences that do not contain stop codons, other assembly standards such as the BB-2 Assembly, BglBricks Assembly, Silver Assembly and the Freiburg Assembly were designed. While the easiest method to assemble BioBrick parts is described above, there also exist several other commonly used assembly methods that offer several advantages over the standard assembly. The 3 antibiotic (3A) assembly allows for the correct assembly to be selected via antibiotic selection, while the amplified insert assembly seeks to overcome the low transformation efficiency seen in 3A assembly. The BioBrick assembly standard has also served as inspiration for using other types of endonucleases for DNA assembly. For example, both the iBrick standard and the HomeRun vector assembly standards employ homing endonucleases instead of type II restriction enzymes.
Sources: en.wikipedia.org
It is a synthetic REV-ERB agonist used mainly in preclinical research. It is not an approved medicine for human use.
It binds to REV-ERBα and REV-ERBβ, nuclear receptors involved in circadian and metabolic gene regulation. This can alter transcription of genes related to lipid and glucose metabolism in experimental models.
No controlled human trials have established that effect. Endurance findings come primarily from rodent studies, and human responses remain unknown.
No. It is an investigational compound without approved therapeutic indications. It is sold for research purposes only in many jurisdictions.