LC-MS/MS comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic REV-ERB agonist | Small-molecule ligand; not a hormone or peptide |
| Molecular formula | C20H24ClN3O4S | Reported for the free base |
| CAS Registry Number | 1379686-30-2 | Unique chemical identifier |
| Common synonyms | SR9009; stenabolic | Stenabolic is informal and not an official name |
| Reported targets | REV-ERBα and REV-ERBβ | Nuclear receptors linked to circadian and metabolic regulation |
In laboratory settings, SR9009 is commonly identified by its molecular structure and its interaction with REV-ERB receptors. Vendors may list it under synonyms such as Stenabolic or REV-ERB agonist, but those names do not define purity or identity. Analytical confirmation typically uses high-performance liquid chromatography with ultraviolet detection or liquid chromatography–mass spectrometry. A reference standard is needed to compare retention time and mass spectrum, because the compound can be confused with related research chemicals.
Handling practices for SR9009 focus on minimizing degradation and contamination. The solid is generally stored desiccated at or below -20 °C, protected from light and moisture. Stock solutions are often prepared in dimethyl sulfoxide or ethanol, then aliquoted to avoid repeated freeze–thaw cycles. Aqueous solubility is low, so formulations for animal studies may require cosolvents or suspending agents. Personnel should follow institutional chemical safety procedures, because toxicological data for humans are incomplete.
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.
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.
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.
Analytical chemists detect SR9009 with liquid chromatography-tandem mass spectrometry, commonly abbreviated LC-MS/MS. Sample preparation may involve protein precipitation, liquid-liquid extraction, or solid-phase extraction before analysis. Laboratories can target the parent compound or its metabolites, depending on the matrix and the purpose of testing. Anti-doping methods require sensitive and specific assays because concentrations in biological samples can be low. Reference standards and validated methods are essential for reliable identification and quantification.
Regulatory agencies have not approved SR9009 for human therapeutic use. It is typically sold as a research chemical with labels stating that it is not for human consumption. The World Anti-Doping Agency prohibits the substance in sport, generally under the category of non-approved substances. Customs and national laws may restrict importation, sale, or possession. Product quality and legal status can vary by country and vendor, and therapeutic claims are not permitted in regulated advertising because the compound lacks approval.
Several misconceptions surround SR9009. It is often described as a SARM, a steroid, or an exercise pill, but its known target is the REV-ERB receptor family. Rodent studies have examined exercise capacity and metabolic markers, yet human outcomes remain unproven. Oral bioavailability appears low in animals, and human pharmacokinetics are not well characterized. Online products may contain impurities or different compounds, so identity and purity testing are important for research use.
=== Diabetes mellitus === GCK mutations reduce the functional efficiency of the glucokinase molecule. Heterozygosity for alleles with reduced enzyme activity results in a higher threshold for insulin release and persistent, mild hyperglycemia. This condition is referred to as maturity onset diabetes of the young, type 2 (MODY2). The most recent overview of GCK mutation that were observed in patients claims 791 mutations, of which 489 are thought to cause the MODY diabetes and therefore reduce the functional efficiency of the glucokinase molecule. Homozygosity for GCK alleles with reduced function can cause severe congenital insulin deficiency, resulting in persistent neonatal diabetes.
=== Liberal revival === Through the 1950s and into the 1960s, the Liberals survived only because a handful of constituencies in rural Scotland and Wales clung to their Liberal traditions, whilst in two English towns, Bolton and Huddersfield, local Liberals and Conservatives agreed to each contest only one of the town's two seats. Jo Grimond, for example, who became Leader of the Liberal Party in 1956, was MP for the remote Orkney and Shetland islands. Under his leadership a Liberal revival began, marked by the Orpington by-election of March 1962 which was won by Eric Lubbock. There, the Liberals won a seat in the London suburbs for the first time since 1935. The Liberals became the first of the major British political parties to advocate British membership of the European Economic Community. Grimond also sought an intellectual revival of the party, seeking to position it as a non-socialist radical alternative to the Conservative government of the day. In particular he canvassed the support of the young post-war university students and recent graduates, appealing to younger voters in a way that many of his recent predecessors had not, and asserting a new strand of Liberalism for the post-war world. The new middle-class suburban generation began to find the Liberals' policies attractive again.
This anonymity and lack of conversation between the doctor and woman patient led to the inquiry diagnosis of the Four Diagnostic Methods being the most challenging. Doctors used a medical doll known as a Doctor's lady, on which female patients could indicate the location of their symptoms. Cheng Maoxian (b. 1581), who practiced medicine in Yangzhou, described the difficulties doctors had with the norm of female modesty. One of his case studies was that of Fan Jisuo's teenage daughter, who could not be diagnosed because she was unwilling to speak about her symptoms, since the illness involved discharge from her intimate areas. As Cheng describes, there were four standard methods of diagnosis – looking, asking, listening and smelling and touching (for pulse-taking). To maintain some form of modesty, women would often stay hidden behind curtains and screens. The doctor was allowed to touch enough of her body to complete his examination, often just the pulse taking. This would lead to situations where the symptoms and the doctor's diagnosis did not agree and the doctor would have to ask to view more of the patient. These social and cultural beliefs were often barriers to learning more about female health. Women were often uncomfortable talking about their illnesses, especially in front of the male chaperones that attended medical examinations. Women would choose to omit certain symptoms as a means of upholding their chastity and honor. One such example is the case in which a teenage girl was unable to be diagnosed because she failed to mention her symptom of vaginal discharge.
{\displaystyle {\boldsymbol {F}}={\begin{bmatrix}1&\gamma &0\\0&1&0\\0&0&1\end{bmatrix}}~;~~{\boldsymbol {B}}={\boldsymbol {F}}\cdot {\boldsymbol {F}}^{T}={\begin{bmatrix}1+\gamma ^{2}&\gamma &0\\\gamma &1&0\\0&0&1\end{bmatrix}}}
Sources: en.wikipedia.org
Glucokinase has a lower affinity for glucose than the other hexokinases. Glucokinase changes conformation and/or function in parallel with rising glucose concentrations in the physiologically important range of 4–10 mM (72–180 mg/dL). It is half-saturated at a glucose concentration of about 8 mM (144 mg/dL). Glucokinase is not inhibited by physiological concentrations of its product, glucose-6-phosphate. This allows continued signal output (e.g., to trigger insulin release) amid significant amounts of its product. Another distinctive property of glucokinase is its moderate cooperativity with glucose, with a Hill coefficient (h) of about 1.7. These features allow it to regulate a "supply-driven" metabolic pathway. That is, the rate of reaction is driven by the supply of glucose, not by the demand for end products. Because of the cooperativity, the kinetic interaction of glucokinase with glucose does not follow classical Michaelis-Menten kinetics. Rather than a Km for glucose, it is more accurate to describe a half-saturation level S0.5, the concentration at which the enzyme is 50% saturated and active. The S0.5 and h result in an inflection of the curve enzyme activity as a function of glucose concentration at about 4 mM. In other words, at a glucose concentration of about 72 mg/dL, which is near the low end of the normal range, glucokinase activity is most sensitive to small changes in glucose concentration.
[...] It is this practice of allowing one set of people to dictate to another set of people what they shall do, what they shall think, what they shall drink, when they shall go to bed, what they shall buy, and where they shall buy it, what wages they shall get and how they shall spend them, against which the Liberal party have always protested. The political terms of "modern", "progressive" or "new" Liberalism began to appear in the mid to late 1880s and became increasingly common to denote the tendency in the Liberal Party to favour an increased role for the state as more important than the classical liberal stress on self-help and freedom of choice. By the early 20th century, the Liberals stance began to shift towards "New Liberalism", what would today be called social liberalism, namely a belief in personal liberty with a support for government intervention to provide social welfare. This shift was best exemplified by the Liberal government of H. H. Asquith and his Chancellor David Lloyd George, whose Liberal reforms in the early 1900s created a basic welfare state. David Lloyd George adopted a programme at the 1929 general election entitled We Can Conquer Unemployment!, although by this stage the Liberals had declined to third-party status. The Liberals as expressed in the Liberal Yellow Book now regarded opposition to state intervention as being a characteristic of right-wing extremists.
== Diagnostics == In TCM, there are five major diagnostic methods: inspection, auscultation, olfaction, inquiry, and palpation. These are grouped into what is known as the "Four pillars" of diagnosis, which are Inspection, Auscultation/ Olfaction, Inquiry, and Palpation (望，聞，問，切).
Sources: en.wikipedia.org
Acrolein (systematic name: propenal) is the simplest unsaturated aldehyde. It is a colorless liquid with a foul and acrid aroma. The smell of burnt fat (as when cooking oil is heated to its smoke point) is caused by glycerol in the burning fat breaking down into acrolein. It is produced industrially from propylene and mainly used as a biocide and a building block to other chemical compounds, such as the amino acid methionine.
enzyme A protein which acts as a catalyst for a biological process by accelerating a specific chemical reaction, typically by binding one or more substrate molecules and decreasing the activation energy necessary for the initiation of a particular reaction involving the substrate(s). Enzymatic catalysis often results in the chemical conversion of the substrate(s) into one or more products, which then inhibit or permit subsequent reactions. All metabolic pathways consist of a series of individual reactions which each depend upon one or more specific enzymes to drive them forward at rates fast enough to sustain life.
At least three methods of total synthesis of morphine from starting materials such as coal tar and petroleum distillates have been patented, the first of which was announced in 1952, by Marshall D. Gates, Jr. at the University of Rochester. Still, the vast majority of morphine is derived from the opium poppy by either the traditional method of gathering latex from the scored, unripe pods of the poppy, or processes using poppy straw, the dried pods and stems of the plant, the most widespread of which was invented in Hungary in 1925 and announced in 1930 by Hungarian pharmacologist János Kabay. In 2003, there was a discovery of endogenous morphine occurring naturally in the human body. Thirty years of speculation were made on this subject because there was a receptor that, it appeared, reacted only to morphine: the μ3-opioid receptor in human tissue. Human cells that form in reaction to cancerous neuroblastoma cells have been found to contain trace amounts of endogenous morphine.
Sources: en.wikipedia.org
SR9009 is a synthetic compound investigated as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is used in preclinical research on circadian rhythm and metabolism. It is not an approved drug.
No. It has no approved medical indication, and human safety and efficacy data are limited. It appears in research chemical markets and is banned by some sports authorities.
Natural ligands include heme and certain metabolites; SR9009 is a synthetic small molecule with higher potency and selectivity in some assays. Its effects depend on cell type and timing. It is not a naturally occurring compound.
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.