If you have been reading about LC-MS/MS and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic REV-ERB agonist | Binds REV-ERBα and REV-ERBβ in preclinical models |
| Molecular formula | C20H24ClN3O4S | Reported for the parent compound |
| CAS Registry Number | 1379686-30-2 | Common identifier in chemical databases |
| Appearance | Off-white to pale yellow solid | Typical research chemical solid |
| Solubility | Soluble in DMSO and ethanol; low in water | Class: small organic molecule |
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.
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.
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.
Common donors in oligosaccharide synthesis are glycosyl halides, glycosyl acetates, thioglycosides, trichloroacetimidates, pentenyl glycosides, and glycals. Of all these donors, glycosyl halides are classic donors, which played a historical role in the development of glycosylation reactions. Thioglycoside and trichloroacetimidate donors are used more than others in contemporary glycosylation methods. When it comes to the trichloroacetimidate method, one of the advantages is that there is no need to introduce heavy metal reagents in the activation process. Moreover, using different bases can selectively lead to different anomeric configurations. (Scheme 2) As to the thioglycosides, the greatest strength is that they can offer temporary protection to the anomeric centre because they can survive after most of the activation processes. Additionally, a variety of activation methods can be employed, such as NIS/ AgOTf, NIS/ TfOH, IDCP (iodine dicollidine perchlorate), iodine, and Ph2SO/ Tf2O. Furthermore, in the preparation of 1, 2-trans glycosidic linkage, using thioglycosides and imidates can promote the rearrangement of the orthoester byproducts, since the reaction mixtures are acidic enough.
An alcohol burner or spirit lamp is a piece of laboratory equipment used to produce an open flame. It can be made from brass, glass, stainless steel or aluminium. Alcohol burners are preferred for some uses over Bunsen burners for safety purposes, and in laboratories where natural gas is not available. Their flame is limited to approximately 5 centimeters (two inches) in height, with a comparatively lower temperature than the gas flame of the Bunsen burner. While they do not produce flames as hot as other types of burners, they are sufficiently hot for performing some chemistries, standard microbiology laboratory procedures, and can be used for flame sterilization of other laboratory equipment. A small alcohol burner is also preferred for camping when the need for fire is modest. It burns the alcohol vapor that rises due to the heat from the flame through the holes on the top perimeter of the container. Typical fuel is denatured alcohol, methanol, or isopropanol. A cap is used as a snuffer for extinguishing the flame.
Many different amino acid side chains have been described as ADP-ribose acceptors. From a chemical perspective, this modification represents protein glycosylation: the transfer of ADP-ribose occurs onto amino acid side chains with a nucleophilic oxygen, nitrogen, or sulfur, resulting in N-, O-, or S-glycosidic linkage to the ribose of the ADP-ribose. Originally, acidic amino acids (glutamate and aspartate) were described as the main sites of ADP-ribosylation. However, many other ADP-ribose acceptor sites such as serine, arginine, cysteine, lysine, diphthamide, phosphoserine, and asparagine have been identified in subsequent works.
In 1988, Bio-Synthesis helped in the synthesis and characterization of a new class of peptides with novel antimicrobial properties discovered at the NIH. In 1989, OCS became incorporated as Bio-synthesis, Inc. and moved its laboratories to Lewisville, Texas. In 1993, Bio-Synthesis was one of the first peptide synthesis companies to acquire a Finnigan MALDI-TOF mass spectrometer for the accurate quality control of synthetic peptides produced in-house. In 1994, Bio-synthesis pioneered the use of molecular methods for HLA analysis which is applied in organ matching for transplantation purposes. Later in the same year Bio-Synthesis held the first major HLA DNA typing workshop with the attendance of HLA laboratory directors from around the country in conjunction with University of North Texas in Denton Texas.
Sources: en.wikipedia.org
In biochemistry, two biopolymers are antiparallel if they run parallel to each other but with opposite directionality (alignments). An example is the two complementary strands of a DNA double helix, which run in opposite directions alongside each other. Nucleic acid molecules have a phosphoryl (5') end and a hydroxyl (3') end. This notation follows from organic chemistry nomenclature, and can be used to define the movement of enzymes such as DNA polymerases relative to the DNA strand in a non-arbitrary manner.
By continuously scanning a surface, such as tissue section, nano-DESI can be used for imaging. By carefully choosing the experimental conditions, such as the nano-DESI solvent, additives, and the ionization mode (positive or negative) we can map the distribution of a wide variety of complex molecules on different surfaces. A few examples to mention are proteins, lipids, small metabolites, drugs or even the distribution of endogenous alkali metals. Nano-DESI has been applied for localized analysis of complex molecules and imaging of tissue sections, microbial communities and environmental samples. By decreasing the inner diameter of the primary and secondary capillaries, spatial resolution can be decreased to 20x20 μm or even smaller facilitating the analysis of individual cells. This way even various proteoforms can be measured in single cells as well as global and spatial metabolomics.
This technology entails the joining of DNA from different species and the subsequent insertion of the hybrid DNA into a host cell. One of the first individuals to develop recombinant DNA technology was a biochemist at Stanford by the name of Paul Berg. In his experimental design in 1974, he cleaved (cut into fragments) the monkey virus SV40. He then cleaved the double helix of another virus, an antibacterial agent known as bacteriophage lambda. In the third step, he fastened DNA from the SV40 to DNA from the bacteriophage lambda. The final step involved placing the mutant genetic material into a laboratory strain of the E. coli bacterium. This last step, however, was not completed in the original experiment.
Tens of thousands of three-dimensional protein structures have been determined by X-ray crystallography and protein nuclear magnetic resonance spectroscopy (protein NMR) and a central question in structural bioinformatics is whether it is practical to predict possible protein–protein interactions only based on these 3D shapes, without performing protein–protein interaction experiments. A variety of methods have been developed to tackle the protein–protein docking problem, though it seems that there is still much work to be done in this field. Other interactions encountered in the field include Protein–ligand (including drug) and protein–peptide. Molecular dynamic simulation of movement of atoms about rotatable bonds is the fundamental principle behind computational algorithms, termed docking algorithms, for studying molecular interactions.
Because their backbones are longer than those of normal peptides, β-peptides form disparate secondary structures. The alkyl substituents at both the α and β positions in a β-amino acid favor a gauche conformation about the bond between the α-carbon and β-carbon. This also affects the thermodynamic stability of the structure. Many types of helix structures consisting of β-peptides have been reported. These conformation types are distinguished by the number of atoms in the hydrogen-bonded ring that is formed in solution; 8-helix, 10-helix, 12-helix, 14-helix, and 10/12-helix have been reported. Generally speaking, β-peptides form a more stable helix than α-peptides. β-Peptides are stable against proteolytic degradation in vitro and in vivo, a potential advantage over natural peptides. β-Peptides have been used to mimic natural peptide-based antibiotics such as magainins, which are highly potent but difficult to use as drugs because they are degraded by proteolytic enzymes.
Sources: en.wikipedia.org
This protein is known to interact with multiple human proteins, verified via two-hybrid screening. A few notable examples include: LATS2: Negatively regulates YAP1 in the Hippo signaling pathway that plays a pivotal role in organ size control and tumor suppression by restricting cell proliferation and promoting apoptosis. ZGPAT (Zinc finger CCCH-type with G patch domain-containing protein): A transcription repressor that negatively regulates expression of EGFR, a gene involved in cell proliferation, survival and migration, suggesting that it may act as a tumor suppressor. RCOR3 (REST Corepressor 3): A protein that may act as a component of a co-repressor complex that represses transcription It also interacts with viral proteins such as: Replicase polyprotein 1ab (SARS-CoV2): A multifunctional protein involved in the transcription and replication of viral RNAs. Protein E7 (Human Papillomavirus): Plays a role in viral genome replication by driving entry of quiescent cells into the cell cycle.
Inositol nicotinate, also known as inositol hexanicotinate or inositol hexaniacinate, is a compound of niacin (vitamin B3) and inositol. It is marketed in the United States as a "no-flush" form of niacin in dietary supplements. When ingested, inositol nicotinate breaks down into inositol and niacin. The niacin component helps widen blood vessels (vasodilation), lowers blood lipid levels (including cholesterol), and inhibits a protein involved in blood clotting. Inositol nicotinate is used to treat blood circulation problems, including: Raynaud's phenomenon Intermittent claudication Some research shows it can improve symptoms of Raynaud's phenomenon over several weeks. However, its effectiveness in treating other conditions like: High cholesterol High blood pressure Leg pain during exercise (due to poor circulation) remains unclear, with studies producing mixed results. Other proposed uses, such as for: Migraines Psoriasis Restless legs syndrome have insufficient supporting evidence. Inositol nicotinate is generally safe when taken by mouth, but possible side effects include:
RdRps can be used as drug targets for viral pathogens as their function is not necessary for eukaryotic survival. By inhibiting RdRp function, new RNAs cannot be replicated from an RNA template strand, however, DNA-dependent RNA polymerase remains functional. Some antiviral drugs against Hepatitis C and COVID-19 specifically target RdRp. These include Sofosbuvir and Ribavirin against Hepatitis C and remdesivir, an FDA approved drug against COVID-19 GS-441524 triphosphate is a substrate for RdRp, but not mammalian polymerases. It results in premature chain termination and inhibition of viral replication. GS-441524 triphosphate is the biologically active form of remdesivir. Remdesivir is classified as a nucleotide analog that inhibits RdRp function by covalently binding to and interrupting termination of the nascent RNA through early or delayed termination or preventing further elongation of the RNA polynucleotide. This early termination leads to nonfunctional RNA that gets degraded through normal cellular processes. Baloxavir marboxil is an approved drug for the treatment of influenza infection. In addition, suraxavir marboxil and tivoxavir marboxil are currently undergoing clinical trials for the same indication. The development of an other inhibitor pimodivir, has been halted.
89. Mymensingh Med J. 2026 Oct;35(4):1312-1316. Diagnosis of Rhinoentomophthoromycosis in a 55 Years Old Male: A Case Report. Shawrave SA(1), Zoheb SJM, Galib GI, Tanni RZ, Shawon MMR, Bhuiyan MJT. Author information: (1)Dr Shaharior Arafat Shawrave, Associate Professor, Department of ENT and Head Neck Surgery, Dhaka Medical College (DMC), Dhaka, Bangladesh; E-mail: shawrave77@gmail.com. Entomophthoromycosis is a chronic fungal infection characterized by a diverse range of manifestations, including subcutaneous, mucocutaneous and visceral infections. The majority of subcutaneous infections caused by entomophthoralean fungi are attributed to Basidiobolus spp, C. coronatus or C. incongruous. In this report, we present a case of rhinoentomophthoromycosis in a middle-aged, immunocompetent male, primarily affecting the nasopharynx. Initially, the diagnosis posed a dilemma, but it was ultimately confirmed through meticulous examination of microscopy and histopathology of the aspirate. The patient's response to antifungal therapy was favorable. We hereby provide a comprehensive account of this case and discuss the efficacy of Posaconazole in the treatment of rhinoentomophthoromycosis in a 55-year-old male patient with diabetes.
Sources: en.wikipedia.org
SR9009 is a synthetic small molecule studied as an agonist of the REV-ERB nuclear receptors. It is not an approved medicine, and its effects in humans are not well characterized.
No. It is a synthetic ligand that binds nuclear receptors, not a steroid or peptide hormone. Its activity depends on receptor binding rather than endocrine secretion.
Clinical evidence is limited. Most published data come from cell and animal experiments. Human safety and efficacy remain uncertain.
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.