LC-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 2026-02-05. Numbers and descriptions here follow the published literature rather than marketing material.
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.
SR9009 is a synthetic small molecule developed as a REV-ERB agonist. It binds to REV-ERBα and REV-ERBβ, nuclear receptors that help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, the compound alters lipid and glucose handling and influences skeletal muscle oxidative capacity. Its exact effects in humans remain largely uncharacterized because controlled clinical trials have not been reported. The molecule is frequently described in preclinical literature as a metabolic modulator.
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.
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.
| 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 |
Regulatory treatment of SR9009 varies by country and context. It is not approved as a therapeutic drug by agencies such as the United States Food and Drug Administration or the European Medicines Agency. Sports authorities list it as a prohibited substance; the World Anti-Doping Agency classifies it among hormone and metabolic modulators. Legal status for personal possession or sale differs across jurisdictions, and some countries may restrict it under analog or research chemical laws. Buyers who seek verified material often rely on independent laboratory testing because online product labels may not match contents.
Laboratory samples of SR9009 are typically handled as research chemicals rather than pharmaceuticals. Suppliers usually state that the material is for research use only and not for human or veterinary administration. Storage recommendations generally call for a freezer at approximately −20 °C, protection from light, and a desiccated environment. The solid is often described as a white to off-white powder. Solubility is commonly reported in organic solvents such as dimethyl sulfoxide and ethanol, with low solubility in water.
Analytical identification and purity assessment often use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Liquid chromatography–tandem mass spectrometry is used to detect and quantify SR9009 in biological matrices, including urine and blood, for anti-doping or pharmacokinetic studies. Nuclear magnetic resonance spectroscopy can confirm molecular structure. Stability depends on form and storage: the solid is generally more stable than solutions, and repeated freeze–thaw cycles may degrade samples. Purity is typically reported as a percentage from a certificate of analysis.
Physicochemical behavior influences handling. SR9009 is described as a solid with limited aqueous solubility, so organic solvents such as dimethyl sulfoxide or ethanol are common in research stock solutions. Aqueous dilution can produce precipitates if the organic content is too low. Light, heat, and repeated freeze-thaw cycles may affect stability. Storage recommendations usually specify a desiccated freezer environment protected from light, but exact stability data depend on the formulation and matrix.
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.
transcript A product of transcription; that is, any RNA molecule which has been synthesized by RNA polymerase using a complementary DNA molecule as a template. When transcription is completed, transcripts separate from the DNA and become independent primary transcripts. Particularly in eukaryotes, multiple post-transcriptional modifications are usually necessary for raw transcripts to be converted into stable and persistent molecules, which are then described as mature, though not all transcribed RNAs undergo maturation. Many transcripts are accidental, spurious, incomplete, or defective; others are able to perform their functions immediately and without modification, such as certain non-coding RNAs.
=== Optical === Carbon nanotubes have useful absorption, photoluminescence (fluorescence), and Raman spectroscopy properties. Spectroscopic methods offer the possibility of quick and non-destructive characterization of relatively large amounts of carbon nanotubes. There is a strong demand for such characterization from the industrial point of view: numerous parameters of nanotube synthesis can be changed, intentionally or unintentionally, to alter the nanotube quality, such as the non-tubular carbon content, structure (chirality) of the produced nanotubes, and structural defects. These features then determine nearly all other significant optical, mechanical, and electrical properties. Carbon nanotube optical properties have been explored for use in applications such as for light-emitting diodes (LEDs) and photo-detectors based on a single nanotube have been produced in the lab. Their unique feature is not the efficiency, which is yet relatively low, but the narrow selectivity in the wavelength of emission and detection of light and the possibility of its fine-tuning through the nanotube structure. In addition, bolometer and optoelectronic memory devices have been realised on ensembles of single-walled carbon nanotubes. Nanotube fluorescence has been investigated for the purposes of imaging and sensing in biomedical applications.
At cytoplasmic conditions, where the ADP/ATP ratio is 10 orders of magnitude from equilibrium, the ΔG is around −57 kJ/mol. Along with pH, the free energy change of ATP hydrolysis is also associated with Mg2+ concentration, from ΔG°' = −35.7 kJ/mol at a Mg2+ concentration of zero, to ΔG°' = −31 kJ/mol at [Mg2+] = 5 mM. Higher concentrations of Mg2+ decrease free energy released in the reaction due to binding of Mg2+ ions to negatively charged oxygen atoms of ATP at pH 7.
===== MeSH D08.811.682.657 – oxidoreductases acting on aldehyde or oxo group donors ===== MeSH D08.811.682.657.163 – aldehyde oxidoreductases MeSH D08.811.682.657.163.249 – aldehyde dehydrogenase MeSH D08.811.682.657.163.249.750 – omega-crystallins MeSH D08.811.682.657.163.311 – aldehyde oxidase MeSH D08.811.682.657.163.342 – aminomuconate-semialdehyde dehydrogenase MeSH D08.811.682.657.163.374 – aspartate-semialdehyde dehydrogenase MeSH D08.811.682.657.163.468 – benzaldehyde dehydrogenase (NADP+) MeSH D08.811.682.657.163.515 – betaine-aldehyde dehydrogenase MeSH D08.811.682.657.163.562 – glutamate-5-semialdehyde dehydrogenase MeSH D08.811.682.657.163.750 – glyceraldehyde-3-phosphate dehydrogenases MeSH D08.811.682.657.163.750.250 – glyceraldehyde 3-phosphate dehydrogenase (nadp+) MeSH D08.811.682.657.163.750.300 – glyceraldehyde-3-phosphate dehydrogenase (nadp+)(phosphorylating) MeSH D08.811.682.657.163.750.350 – glyceraldehyde-3-phosphate dehydrogenase (phosphorylating) MeSH D08.811.682.657.163.781 – glycolaldehyde dehydrogenase MeSH D08.811.682.657.163.796 – l-aminoadipate-semialdehyde dehydrogenase MeSH D08.811.682.657.163.812 – malonate-semialdehyde dehydrogenase (acetylating) MeSH D08.811.682.657.163.827 – methylmalonate-semialdehyde dehydrogenase (acylating) MeSH D08.811.682.657.163.835 – retinal dehydrogenase MeSH D08.811.682.657.163.843 – succinate-semialdehyde dehydrogenase MeSH D08.811.682.657.163.875 – succinate-semialdehyde dehydrogenase (NAD(P)+) MeSH D08.811.682.657.180 – formate dehydrogenases MeSH D08.811.682.657.350 – ketone oxidoreductases MeSH D08.811.682.657.350.750 – ketoglutarate dehydrogenase complex MeSH D08.811.682.657.350.750.500 – dihydrolipoamide dehydrogenase MeSH D08.811.682.657.350.760 – 3-methyl-2-oxobutanoate dehydrogenase (lipoamide) MeSH D08.811.682.657.350.825 – 2-oxoisovalerate dehydrogenase (acylating) MeSH D08.811.682.657.350.875 – pyruvate dehydrogenase (lipoamide) MeSH D08.811.682.657.350.937 – pyruvate oxidase MeSH D08.811.682.657.350.968 – pyruvate synthase
=== Vaccine skepticism and connection to autism === In 2009, Carrey wrote an article questioning the merits of vaccination and discussing its connection to autism for The Huffington Post. With former partner Jenny McCarthy, Carrey led a "Green Our Vaccines" march in Washington, D.C., to advocate for the removal of "toxic substances" from children's vaccines, out of a belief that children had received "too many vaccines, too soon, many of which are toxic". The rally was criticized by David Gorski, an American surgical oncologist on Science-Based Medicine blog, for being anti-vaccine and not "pro-safe vaccine", and by Steven Parker on the WebMD website for being "irresponsible". In 2009, the couple appeared on Larry King Live to discuss autism. Carrey stated that he believes autism "is preventable and treatable," and that "it's still shocking to see how many people are ignoring this information." Carrey suggested rising autism rates was a warning about the medical industry, stating: "There's an autistic child on every block ... Autism is the canary in the coal mine. I believe that it's telling us that this vaccine program is imbalanced." On July 1, 2015, after the signing of a new vaccination law, Carrey called California governor Jerry Brown a "corporate fascist" who was "poisoning" children by enacting the vaccination requirements. The law disallowed religious and philosophical reasons for exemption from vaccination.
Sources: en.wikipedia.org
Lücking (2020) notes that the cladistic era laid the groundwork that made the transition to molecular phylogenetics relatively seamless: researchers already expected to use computers and algorithms, understood the importance of synapomorphies, and were prepared to revise taxonomy when evidence demanded. Cladistics ended the idea of lichen exceptionalism: lichens now had to fit into the tree of life under the same systematic rules as other organisms. System‑wide name curation entered a new phase in 1982 when Ove Eriksson issued the first Outline of the Ascomycetes, a periodically updated checklist that synthesized every formal taxonomic change. Retitled Outline of Ascomycota in 1999 and maintained through successive editions by Eriksson, Thorsten Lumbsch, Amy Huhndorf and collaborators, the living document functioned as a community "open‑source" ledger. Its numbered notes traced each genus‑level move and provided a stable reference frame that eased the transition from morphology‑based to molecule‑based systematics, right up to the final 2010 update.
After bomb attacks in Capaci and Via D'Amelio that killed prosecutors Giovanni Falcone and Paolo Borsellino, the arrest of Salvatore Riina on 15 January 1993 and the introduction of strict prison regime (article 41-bis), Cosa Nostra embarked on a terrorist campaign in which Messina Denaro played a prominent role. The remaining Mafia bosses, among them Messina Denaro, Giovanni Brusca, Leoluca Bagarella, Antonino Gioè, Giuseppe Graviano and Gioacchino La Barbera, met several times (often in the Santa Flavia area in Bagheria on an estate owned by the mafioso Leonardo Greco). They decided on a strategy to force the Italian state to retreat. That resulted in a series of bomb attacks in the Via dei Georgofili in Florence, in Via Palestro in Milan, in the Piazza San Giovanni in Laterano and Via San Teodoro in Rome, which left 10 people dead and 93 injured as well as damage to centres of cultural heritage such as the Uffizi Gallery. Messina Denaro also tailed the TV journalist Maurizio Costanzo, host of the Maurizio Costanzo Show, who had just escaped a car bomb attack on 14 May 1993. He also observed the movements of Falcone and the Minister of Justice, Claudio Martelli, in 1991. After the 1993 bombings, Messina Denaro went into hiding as of June 1993. According to investigators, between 1994 and 1996 Messina Denaro spent time in his hiding place located between Aspra and Bagheria with his lover Maria Mesi, with whom he went on vacation to Greece under the false name of "Matteo Cracolici".
Biochemistry laboratories often use in vitro studies to explore ATP-dependent molecular processes. ATP analogs are also used in X-ray crystallography to determine a protein structure in complex with ATP, often together with other substrates. Enzyme inhibitors of ATP-dependent enzymes such as kinases are needed to examine the binding sites and transition states involved in ATP-dependent reactions. Most useful ATP analogs cannot be hydrolyzed as ATP would be; instead, they trap the enzyme in a structure closely related to the ATP-bound state. Adenosine 5′-(γ-thiotriphosphate) is an extremely common ATP analog in which one of the gamma-phosphate oxygens is replaced by a sulfur atom; this anion is hydrolyzed at a dramatically slower rate than ATP itself and functions as an inhibitor of ATP-dependent processes. In crystallographic studies, hydrolysis transition states are modeled by the bound vanadate ion. Caution is warranted in interpreting the results of experiments using ATP analogs, since some enzymes can hydrolyze them at appreciable rates at high concentration.
Assessment — This step involves collecting data pertinent to the patient, including nutrition-related History, anthropometric Measurements, biochemical data, nutrition-focused physical findings, client history and comparative standards. Diagnosis — Based on the assessment data collected, a nutrition problem may be diagnosed. Causes and contributing factors are identified. Intervention — Based on the nutrition diagnosis, problems are addressed that aid in alleviation of the diagnosis’ signs and symptoms. Activities are constructed to enable the patient to work towards objectives set for them by themselves and their nutrition professional. Monitoring/Evaluation — Progress made on goals and/or expected outcomes is tracked to ensure that nutrition problems are being addressed; adjustments in the Intervention step are made according to progress.
=== Danger of confusion with paregoric === In the United States, opium tincture contains 10 mg per mL of anhydrous morphine. By contrast, opium tincture's weaker cousin, paregoric, also confusingly known as "camphorated tincture of opium", is 1/25th the strength of opium tincture, containing only 0.4 mg of morphine per mL. A 25-fold morphine overdose may occur if opium tincture is used where paregoric is indicated. Opium tincture is almost always dosed in drops, or fractions of a mL, or less commonly, in minims, while paregoric is dosed in teaspoons or tablespoons. Thus, an order for opium tincture containing directions in teaspoons is almost certainly in error. To avoid this potentially fatal outcome, the term "camphorated tincture of opium" is avoided in place of paregoric since the former can easily be mistaken for opium tincture. In 2004, the FDA issued a "Patient Safety" news bulletin stating that "To help resolve the confusion [between opium tincture and paregoric], FDA will be working with the manufacturers of these two drugs to clarify the labeling on the containers and in the package inserts." Indeed, in 2005, labels for opium tincture began to include the concentration of morphine (10 mg/mL) in large text beneath the words "Opium Tincture".
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.
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.