The short version of Stenabolic fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-03-11. Anything still debated is marked as such rather than presented as settled.
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.
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.
REV-ERB proteins typically suppress gene expression by recruiting corepressor complexes to DNA response elements. SR9009 binds these receptors and strengthens that repressive action in cell-based assays. Studies in rodents have reported changes in lipid handling, mitochondrial function, and exercise capacity after treatment. Such findings are often cited as evidence for metabolic effects, but species differences and limited pharmacokinetic data make direct translation to humans uncertain. Researchers continue to examine which effects are robust and which depend on specific experimental conditions.
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.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | SR9009; Stenabolic | Nickname is not a chemical name. |
| Typical analytical method | LC-MS/MS | Often with isotope-labeled internal standard. |
| Storage temperature | -20 °C | Desiccated and protected from light. |
| Solution stability | DMSO stock; avoid freeze-thaw | Store at -20 to -80 °C. |
| Regulatory status | Not approved; varies by country | May be restricted as research chemical. |
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.
SR9009 is a synthetic small molecule studied as a REV-ERB agonist. REV-ERBα and REV-ERBβ are nuclear receptors that help regulate circadian rhythms and metabolic gene expression. The compound was identified in academic screening efforts to find synthetic ligands for these receptors. In cell and animal studies, SR9009 alters transcription of genes involved in lipid and glucose metabolism, and it can shift circadian behavior. It is not an approved therapeutic agent.
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.
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.
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.
=== Extremism and hate === Concerns have been voiced regarding content relating to, and the promotion and spreading of, hate speech and far-right extremism, such as antisemitism, islamophobia, racism, and xenophobia. Some videos were shown to expressly promote Holocaust denial and told viewers to take up arms and fight in the name of white supremacy and the swastika. As TikTok has gained popularity among young children, and the popularity of extremist and hateful content is growing, calls for tighter restrictions on their flexible boundaries have been made. TikTok has since released tougher parental controls to filter out inappropriate content and to ensure they can provide sufficient protection and security. In October 2019, TikTok removed about two dozen accounts that were responsible for posting ISIL propaganda and execution videos on the app. In Malaysia, TikTok is used by some users to engage in hate speech against race and religion especially mentioning the 13 May incident after the 2022 election. TikTok responded by taking down videos with content that violated their community guidelines. In March 2023, The Jewish Chronicle reported that TikTok still hosted videos that promoted the neo-Nazi propaganda film Europa: The Last Battle, despite having been alerted to the issue four months prior. TikTok said it removed and would continue to remove the content and associated accounts and has blocked the search term as well.
== In popular culture == In Agatha Christie's 1937 mystery Cards on the Table, Hexobarbital is used in conjunction with Veronal to induce overdose. It is referred to by Hercule Poirot as both N-methyl-cyclo-hexenyl-methyl-malonyl urea and Evipan. It was also used in Graham Greene's The Heart of the Matter (1948) Evipan was prescribed for a main character in tablet form to use as a sleeping aid.
Clostripain (EC 3.4.22.8, clostridiopeptidase B, clostridium histolyticum proteinase B, alpha-clostridipain, clostridiopeptidase, Endoproteinase Arg-C) is a cysteine protease that cleaves proteins on the carboxyl peptide bond of arginine. It was isolated from Clostridium histolyticum. The isoelectric point of the enzyme is 4.8-4.9 (at 8 °C), and optimum pH is 7.4~7.8 (against α-benzoyl-arginine ethyl ester). The composition of the enzyme is indicated to be of two chains of relative molecular mass 45,000 and 12,500.
Likewise, mutations found on other subunits of the complex, like the DLAT gene found on the E2 subunit, the PDHX gene found on the E3 subunit, as well as a mutation on a pyruvate dehydrogenase phosphatase gene, known as PDP1, have all been traced back to pyruvate dehydrogenase deficiency, while their specific contribution to the disease state is unknown. In the metabolic disease combined malonic and methylmalonic aciduria (CMAMMA) due to ACSF3 deficiency, mitochondrial fatty acid synthesis (mtFAS) is impaired, which is the precursor reaction of lipoic acid biosynthesis. The result is a reduced lipoylation degree of important mitochondrial enzymes, such as pyruvate dehydrogenase complex (PDC) and oxoglutarate dehydrogenase complex (OGDC).
Sources: en.wikipedia.org
=== Instrument Calibration and Quality Control === All refractive index detectors require calibration upon first setting up the instrument as well as periodic quality control. Most manufacturer's recommend calibration with pure water and a sucrose calibration solution of a known refractive index. Once the instrument is in calibration mode, the pure water acts as a zero baseline reading, while the sucrose solution compares its known RI to the output, and the machine is adjusted accordingly. After the pump has not been used for a while, it is necessary to purge the tubes of any contaminant air that has diffused into the channels. This is typically accomplished with isopropyl alcohol.
Senate Minority Leader Chuck Schumer criticized the investigation for undermining the Federal Reserve's independence and suggested that the investigation was being done to make Powell a scapegoat for public disapproval of Trump's handling of the U.S. economy and the administration's trade policies. After Trump announced that he would nominate Warsh to replace Powell on January 30, Tillis stated that he will oppose Warsh's nomination until the investigation into Powell is "fully and transparently resolved." Since the Senate Banking Committee's composition currently includes 13 Republicans and 11 Democrats, Tillis has the ability to block the committee from voting to advance Warsh's nomination to a full Senate confirmation vote. John Thune has said that Warsh will "probably not" be confirmed without support from Tillis. On February 4, Tillis, who is not seeking reelection in 2026, subsequently said that he will block Warsh's nomination for the remainder of the 119th United States Congress if the investigation continues until his term expires in January 2027, while the day before, Senate Democrats sitting on the Banking Committee called for a delay to the nomination until both the Powell investigation and the investigation of Lisa Cook were both ended. Tillis stated the previous September that he would not consider any replacement for Cook until the litigation was resolved.
The properties of quantum dots can be also tuned by the synthetic scheme, high temperature solvent/ligand mixtures that influence the nanocrystal properties. High-quality QD contrast agents are obtained at elevated temperatures; however, because they have lower water solubility, their usage as cell markers is limited. Further functionalization with hydrophilic ligands is required. The advantages of QD are represented by their fast action; they are able to label a target tissue or cell in seconds. In vivo studies show that QD are able to selectively label cancer cells, and they accumulate at tumor sites. Tumor cells labeled with QD can be tracked with multiphoton microscopy as they invade lung tissue. In both studies, spectral imaging and autofluorescent subtraction allowed multicolour in vivo visualization of cells and tissues. A major drawback of QD is their relatively high toxicity. Functionalizations with different substrates that increase bioaffinity and decrease toxicity are in progress. For instance, sulfur from the QD shell is able to form reversible disulfide bonds with a wide class of organic compounds.
Main sections: §§ Signaling after internalisation and Conformational states The persistent signaling that is present after internalisation could be the reason for ineffectivity of common KOR antagonists given that they work on receptor's outer membrane. Antagonists also tend to preserves conformation states; in this case presumably "alternative state" due to the endogenous bias for the β-arrestin signaling during stress responses.
=== Pharmacokinetics === The two active components of the medication, ibuprofen and hydrocodone, do not affect each other's absorption characteristics or other pharmacokinetic parameters. After an oral dose, the peak level of hydrocodone in the blood is reached 1.7 hours after administration. The blood levels of ibuprofen peak 1.8 hours after oral administration.
Sources: en.wikipedia.org
The Pacinian corpuscle (also lamellar corpuscle, or Vater–Pacini corpuscle) is a low-threshold mechanoreceptor, responsive to deep pressure, stretch, tickle and vibration, found in the skin and other internal organs. In the skin it is one of the four main types of cutaneous receptors. The corpuscles are present in skin notably on both surfaces of the hands and feet, arms, and neck. Pacinian corpuscles are also found on bone periosteum, joint capsules, the pancreas and other internal organs, the breast, genitals, and lymph nodes. Pacinian corpuscles are rapidly adapting mechanoreceptors. As phasic receptors they respond quickly but briefly to a stimulus with the response diminishing even when the stimulus is maintained. They primarily respond to vibration, and deep pressure. They are especially sensitive to high-frequency vibrations. Groups of corpuscles sense pressure changes (such as on grasping or releasing an object). They are additionally crucially involved in proprioception. The vibrational role may be used for detecting surface texture, such as rough and smooth.
== Nerve supply == Heart rate depends on the rate at which the sinoatrial node produces action potentials. At rest, the human heart rate is between 60 and 100 beats per minute. This is a result of the activity of two sets of nerves, one acting to slow down action potential production (these are parasympathetic nerves) and the other acting to speed up action potential production (sympathetic nerves). Modulation of heart rate by ANS is carried by two types of channel: Kir and HCN (members of the CNG gated channels). The sympathetic nerves begin in the thoracic region of the spinal cord (in particular T1-T4). These nerves release a neurotransmitter called noradrenaline (NA). This binds to a receptor on the SA node membrane, called a beta-1adrenoceptor. Binding of NA to this receptor activates a G-protein (in particular a Gs-Protein, S for stimulatory) which initiates a series of reactions (known as the cAMP pathway) that results in the production of a molecule called cyclic adenosinemonophosphate (cAMP). This cAMP binds to the HCN channel (see above). Binding of cAMP to the HCN increases the flow of Na+ and K+ into the cell, speeding up the pacemaker potential, so producing action potentials at a quicker rate and increasing heart rate. An increase in heart rate is known as positive chronotropy. The parasympathetic nerves supplying the SA node (in particular the Vagus nerves) originate in the brain. These nerves release a neurotransmitter called acetylcholine (ACh). ACh binds to a receptor called an M2 muscarinic receptor, located on the SA node membrane.
===== Gravimetric method ===== The increased mass of the MOF due to the stored hydrogen is directly calculated by a sensitive microbalance. Due to buoyancy, the detected mass of adsorbed hydrogen decreases again when a sufficiently high pressure is applied to the system because the density of the surrounding gaseous hydrogen becomes more and more important at higher pressures. Thus, this "weight loss" has to be corrected using the volume of the MOF's frame and the density of hydrogen.
On December 2, 2009, Akram Elias traveled to the Hotel Nacional de Cuba in Havana to meet with Alan Gross. Gross was arrested the next night, on December 3, 2009, sentenced to 15 years in prison for subversion. Gross and his lawyers maintained that if he had been carrying clandestine intelligence materials into the country, that he was doing it unknowingly. In 2010, the Grand Lodge of Cuba publicly accused former Grand Master Collera Venta and two other Cuban Freemasons of corruption and dereliction of duty. They accused these men of allowing a foreigner, a Freemason from Miami, to attend a meeting at a Temple in Cuba in 2009. They alleged that this violated a rule that only allowed Cuban Freemasons into the Temple. The Supreme Court of Masonic Justice set a trial date for June 2010, and sent out "Masonic investigators" of the Court to determine the facts of the case. Collera Venta wrote a letter in April 2010 in which he said that the accusations were false, and insisted that Cuban exiles were to blame.
Sources: en.wikipedia.org
The most common approach is liquid chromatography-tandem mass spectrometry, often after extraction from blood, urine, or tissue. Ultraviolet detection and nuclear magnetic resonance spectroscopy are used mainly for reference material characterization. Isotope-labeled internal standards improve accuracy.
Solid material is usually kept at -20 °C, desiccated, and protected from light. Dimethyl sulfoxide stocks should be stored cold and subjected to minimal freeze-thaw cycles. Aqueous solutions are generally less stable and should be prepared fresh when possible.
Legality depends on the country and the intended use. It is not an approved medicine, and some places restrict or ban sales for human consumption. Buyers should verify local rules and product documentation before procurement.
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.