LC-MS/MS is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-01-28. Numbers and descriptions here follow the published literature rather than marketing material.
Regulatory status varies by country and intended use. Major drug agencies have not granted marketing authorization for SR9009 as a medicine, and it is not listed as a controlled substance in many jurisdictions. It is often sold as a research chemical, a category that may fall outside pharmaceutical manufacturing rules. Buyers should verify local laws and supplier documentation, including certificates of analysis. The lack of standardized quality controls raises concerns about identity, purity, and actual content in products marketed online.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white solid | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, dark | Protect from repeated temperature changes. |
| Common analytical method | LC-MS or HPLC-UV | Reference standard required for comparison. |
| Common synonyms | SR9009; Stenabolic; REV-ERB agonist | Vendor naming may vary. |
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.
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.
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.
L-Alanine (34.36%) Glycine (27.23%) L-Serine (9.58%) L-Valine (3.49%) L-Threonine (2.00%) [*SAA contains other amino acids but only those representing >2.00% are listed due to their greater relevance]
The Rockefeller Foundation is an American private foundation and philanthropic medical research and arts funding organization based at 420 Fifth Avenue, New York City. The foundation was created by Standard Oil magnate John D. Rockefeller ("Senior") and son "Junior", and their primary business advisor, Frederick Taylor Gates, on May 14, 1913, when its charter was granted by New York. It is the second-oldest major philanthropic institution in America (after the Carnegie Corporation) and ranks as the 35th largest foundation globally by endowment, with assets of over $6.4 billion in 2023. The Rockefeller Foundation is legally independent from other Rockefeller entities, including the Rockefeller University and Rockefeller Center. The foundation operates under the oversight of its own independent board of trustees, with its own resources and distinct mission. Since its inception, the foundation has donated billions of dollars to various causes, becoming the largest philanthropic enterprise in the world by the 1920s. The foundation has maintained an international reach since the 1930s and major influence on global non-governmental organizations. The World Health Organization is modeled on the International Health Division of the foundation, which sent doctors abroad to study and treat human subjects. The National Science Foundation and National Institute of Health are also modeled on the work funded by Rockefeller. It has also been a supporter of and influence on the United Nations.
Glossary of cellular and molecular biology (0–L) lists terms beginning with numbers and those beginning with the letters A through L. Glossary of cellular and molecular biology (M–Z) (this page) lists terms beginning with the letters M through Z. This glossary is intended as introductory material for novices (for more specific and technical detail, see the article corresponding to each term). It has been designed as a companion to Glossary of genetics and evolutionary biology, which contains many overlapping and related terms; other related glossaries include Glossary of virology and Glossary of chemistry.
=== Labia === The large outer pair of folds are the labia majora, which contain and protect the labia minora and other structures of the vulva. The labia majora meet at the front of the mons pubis, and meet posteriorly at the urogenital triangle (the anterior part of the perineum) below the anus. The labia minora are the small inner pair of skin folds that protect the openings. The labia minora are often pink or brownish black, relevant to the person's skin color. The grooves between the labia majora and minora are called the interlabial sulci, or interlabial folds. The labia minora meet posteriorly as the frenulum (fourchette).
Sources: en.wikipedia.org
Additionally, arsenic trioxide degrades poly(ADP-ribose) polymerase, which, combined with the activation of caspases, inhibits DNA repair and halts the cell cycle. The phase of the cell cycle at which the blockage occurs primarily depends on the p53 protein. In cells containing the so-called "wild type" (non-mutated) p53, the cell cycle is halted in the interphase, while in cells with mutated p53, it is halted in the G2/M phase.
=== Modulation === A neurotransmitter may have an excitatory, inhibitory or modulatory effect on the target cell. The effect is determined by the receptors the neurotransmitter interacts with at the post-synaptic membrane. Neurotransmitters influence trans-membrane ion flow either to increase (excitatory) or to decrease (inhibitory) the probability that the cell with which it comes in contact will produce an action potential. Synapses containing receptors with excitatory effects are called Type I synapses, while Type II synapses contain receptors with inhibitory effects. Thus, despite the wide variety of synapses, they all convey only these two types of messages. The two types have different appearances and primarily act on different parts of neurons. Receptors with modulatory effects are spread throughout all synaptic membranes and binding of neurotransmitters sets in motion signaling cascades that help the cell regulate its function. Binding of neurotransmitters to receptors with modulatory effects can have many results. For example, it may increase or decrease in sensitivity to future stimuli by recruiting more or fewer receptors to the synaptic membrane. Type I (excitatory) synapses are typically located on the shafts or the spines of dendrites, whereas type II (inhibitory) synapses are typically located on the cell body. In addition, Type I synapses have round synaptic vesicles, whereas the vesicles of type II synapses are flattened.
== Production == Chlorothalonil can be produced by the direct chlorination of isophthalonitrile or by dehydration of tetrachloroisophthaloyl amide with phosphoryl chloride. It is a white solid. It breaks down under basic conditions, but is stable in neutral and acidic media. Technical grade chlorothalonil contains traces of TCDD and hexachlorobenzene, both are persistent organic pollutants banned under the Stockholm Convention.
Sources: en.wikipedia.org
The latest ONS data shows that inflation was 2.2% in August, unchanged from the previous month. The UK operator of TGI Fridays goes into administration, putting 4,500 jobs at risk. 19 September A BBC investigation, which includes testimony from over 20 female ex-employees, reveals serious sexual abuse allegations by the late former Harrods owner Mohamed Al-Fayed. The Bank of England holds interest rates at 5%. BBC News reports that a number of offenders released early from prison to ease overcrowding have yet to be fitted with electronic tags, despite this being a condition of their release. The Met Office issues a yellow warning for thunderstorms for 20 and 21 September following a period of unseasonably warm weather. The final edition of the London Evening Standard is published, before it switches to a weekly format titled The London Standard, published each Thursday from 26 September. 20 September The UK's debt-to-GDP reaches 100%, its highest level since 1961. A tornado strikes the Hampshire town of Aldershot, causing damage to properties and trees. The UK operation of the international construction company ISG collapses, with the loss of 2,200 jobs. Steven Wilson, who suffered life-changing injuries after being stabbed as he worked in a prison kitchen while serving a sentence for burglary, is awarded more than £5m in damages by the High Court. The UK government confirms that domestic abuse specialists will be "embedded" in emergency 999 call centres in England and Wales as part of plans to halve the number of incidents of violence against women and girls in ten years.
The English word "organ" dates back to the twelfth century, referring to any musical instrument. By the late 14th century, the musical term's meaning had narrowed to refer specifically to the keyboard-based instrument. At the same time, a second meaning arose, in reference to a "body part adapted to a certain function". Plant organs are made from tissue composed of different types of tissue. The three tissue types are ground, vascular, and dermal. When three or more organs are present, it is called an organ system. The adjective visceral, also splanchnic, is used for anything pertaining to the internal organs. Historically, viscera of animals were examined by Roman pagan priests like the haruspices or the augurs in order to divine the future by their shape, dimensions or other factors. This practice remains an important ritual in some remote, tribal societies. The term "visceral" is contrasted with the term "parietal", meaning "of or relating to the wall of a body part, organ or cavity" The two terms are often used in describing a membrane or piece of connective tissue, referring to the opposing sides.
Borderline personality disorder (BPD) is a personality disorder characterized by a pervasive, long-term pattern across several contexts of significant interpersonal relationship instability, extreme fear of abandonment, and intense emotional outbursts. People with BPD frequently exhibit self-harming behaviors and engage in risky activities, primarily caused by difficulties in regulating emotions. Symptoms such as dissociation, a pervasive sense of emptiness, and distorted sense of self are prevalent. Onset of symptoms can be triggered by events others perceive as normal, with the disorder typically manifesting in early adulthood and persisting across diverse contexts. BPD is often comorbid with substance use disorders, depressive disorders, and eating disorders. Studies estimate up to 10 percent of people with BPD die by suicide, a rate approximately 730 times greater than the general population in the United States. BPD faces significant stigmatization in media portrayals and the psychiatric field, leading to underdiagnosis and insufficient treatment. Causes of BPD are unclear and complex, implicating genetic, neurological, and psychosocial conditions in its development. The current hypothesis suggests BPD is caused by an interaction between genetic factors and adverse childhood experiences. BPD is significantly more common in people with a family history of BPD, particularly immediate relatives, suggesting genetic predisposition. There is a risk of misdiagnosis, with BPD commonly confused with a mood disorder, substance use disorder, or other mental health disorders.
By May 1619, the San Juan Bautista was in the Port of Luanda loading 350 African slaves for transport. The captain, a relative of de Acuña, sailed the Africans to Jamaica, during which time over one hundred of them died of illness. He traded twenty-four of them and set sail for Veracruz, but was attacked by two English ships, the White Lion and Treasurer. The captain surrendered, and the English ships split sixty of the Africans between them. The incident was described as follows:
Sources: en.wikipedia.org
Liquid chromatography–mass spectrometry is common for identity and purity checks. High-performance liquid chromatography with ultraviolet detection can also be used. Both methods require a suitable reference standard.
The solid is usually kept desiccated at -20 °C or lower and protected from light. Stock solutions are aliquoted to limit freeze–thaw cycles. Aqueous solutions are not generally recommended for long-term storage.
Laws differ by country and by intended use. It is not an approved medicine, and many vendors sell it as a research chemical. Purchasers are responsible for confirming local restrictions.
Legality depends on the country and the intended use. In many places it is not approved as a medicine and may be sold only as a research chemical. Importation or possession can be restricted, and sports organizations prohibit it.