certificate of analysis 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.
Last reviewed on 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
| 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 |
Quality control for research materials includes identity confirmation by nuclear magnetic resonance and purity assessment by high-performance liquid chromatography. Mass spectrometry provides molecular weight confirmation and can detect related impurities. Purchasers should request a certificate of analysis that lists lot-specific data. Online products advertised for human use often lack such documentation. Distinguishing legitimate research material from mislabeled or contaminated samples is a recurring challenge in independent testing, and independent laboratories may use orthogonal methods to verify identity.
Detection of SR9009 in biological samples usually relies on liquid chromatography coupled to tandem mass spectrometry. This approach separates the compound from matrix components and identifies it by mass transitions. Because SR9009 can undergo metabolism, laboratories often look for both parent drug and specific metabolites. Sample preparation may involve protein precipitation or solid-phase extraction. Method validation examines sensitivity, carryover, and interference from related substances, and reference standards are required for accurate calibration.
Storage recommendations for SR9009 reference material typically specify a freezer at -20 °C or lower, with protection from moisture and light. Repeated freeze-thaw cycles can degrade small molecules and introduce variability. Stock solutions in dimethyl sulfoxide are often aliquoted to avoid repeated handling. Stability studies may examine degradation under heat, humidity, and light exposure. The compound's thiophene and nitro groups can participate in reactions that alter analytical signals over time, so such changes affect quantitative results.
On 15 September 2024, Bukele stated that his 2025 government budget would not include "a single cent of debt for current spending" ("solo centavo de deuda para gasto corriente") and that his government would not take out foreign loans to pay for the budget. On 16 October, El Salvador and J.P. Morgan & Co. agreed to restructure US$1.03 billion of the country's debt as a part of a debt-for-nature swap, which Bukele described as "reaffirm[ing] this government's commitment to economic growth". In the agreement, El Salvador would allocate US$352 million in savings towards conserving the environment around the Lempa River. On three occasions in 2024, Bukele offered to buy back billions of dollars worth of government bonds due by 2034. In November 2024, the Central American Bank for Economic Integration announced that it would give the Salvadoran government $646 million to finance infrastructure projects. Bukele stated that the bank's support would help El Salvador's "economic takeoff" ("despegue económico"). Later that month, Bukele wrote on X that he supported mining gold, describing it as "wealth that could transform El Salvador". He further described the country's metal mining ban as "absurd". The Catholic Church, which supported the mining ban's implementation in 2017, called on Bukele to not repeal the ban, citing environmental concerns. The Legislative Assembly repealed the ban on 23 December 2024 and Bukele approved the law that same day.
January 7 Killing of Renée Good: A 37-year-old woman is shot and killed by an Immigration and Customs Enforcement officer in Minneapolis, Minnesota. Trump announces that the United States will withdraw from 66 international organizations. The Department of State suspends all ongoing assistance programs to Somalia. Two people are killed and six others are injured in a mass shooting during a funeral at a LDS Church meetinghouse in Salt Lake City, Utah. January 10 – 2025–26 measles outbreak: North Carolina experiences a surge in measles over the past week, with cases rising to 310 in the state alone. Nearly 2,500 are reported nationally. January 11 Federal prosecutors open a criminal investigation into Federal Reserve chair Jerome Powell over the testimony he gave to a Senate committee about renovations to Federal Reserve buildings. Low-cost airline Allegiant Air purchases Sun Country Airlines for $1.5 billion. Three inmates are killed, thirteen others are hospitalized, and a guard is injured when violence breaks out at the Washington State Prison in Davisboro, Georgia. January 12 Mattel launches its first autistic Barbie. January 13 The Trump administration designates the Muslim Brotherhood in Egypt, the Islamic Group in Lebanon, and the Islamic Action Front in Jordan as foreign terrorist organizations for their support of Hamas. Meta announces the closure of the studios Armature Studio, Sanzaru Games, and Twisted Pixel. In addition, they announced more than 1,000 workers would be laid off in their Reality Labs business.
The cellular response in signal transduction cascades involves alteration of the expression of effector genes or activation/inhibition of targeted proteins. Regulation of protein activity mainly involves phosphorylation/dephosphorylation events, leading to its activation or inhibition. It is the case for the vast majority of responses as a consequence of the binding of the primary messengers to membrane receptors. This response is quick, as it involves regulation of molecules that are already present in the cell. On the other hand, the induction or repression of the expression of genes requires the binding of transcriptional factors to the regulatory sequences of these genes. The transcriptional factors are activated by the primary messengers, in most cases, due to their function as nuclear receptors for these messengers. The secondary messengers like DAG or Ca2+ could also induce or repress gene expression, via transcriptional factors. This response is slower than the first because it involves more steps, like transcription of genes and then the effect of newly formed proteins in a specific target. The target could be a protein or another gene.
Messenger RNA (mRNA) carries information about a protein sequence to the ribosomes, the protein synthesis factories in the cell. It is coded so that every three nucleotides (a codon) corresponds to one amino acid. In eukaryotic cells, once precursor mRNA (pre-mRNA) has been transcribed from DNA, it is processed to mature mRNA. This removes its introns—non-coding sections of the pre-mRNA. The mRNA is then exported from the nucleus to the cytoplasm, where it is bound to ribosomes and translated into its corresponding protein form with the help of tRNA. In prokaryotic cells, which do not have nucleus and cytoplasm compartments, mRNA can bind to ribosomes while it is being transcribed from DNA. After a certain amount of time, the message degrades into its component nucleotides with the assistance of ribonucleases. Transfer RNA (tRNA) is a small RNA chain of about 80 nucleotides that transfers a specific amino acid to a growing polypeptide chain at the ribosomal site of protein synthesis during translation. It has sites for amino acid attachment and an anticodon region for codon recognition that binds to a specific sequence on the messenger RNA chain through hydrogen bonding.
Sources: en.wikipedia.org
== Osmium isotopes in radiometric dating == The isotopic ratio of osmium-187 and osmium-188 (187Os/188Os) can be used as a window into geochemical changes throughout the ocean's history. The average marine 187Os/188Os ratio in oceans is 1.06. This value represents a balance of the continental riverine inputs of Os with a 187Os/188Os ratio of ~1.3, and the mantle/extraterrestrial inputs with a 187Os/188Os ratio of ~0.13. The lighter isotope, 187Os, is produced by beta decay of 187Re. This decay has actually increased the 187Os/188Os ratio of the bulk silicate earth (Earth less the core) by 33%. The difference between crust and mantle ratios is explained this way: crustal rocks have a much higher level of rhenium. Re is concentrated in the crust relative to the mantle due to partial melting of the mantle (differentiation). Because Re is partitioned into the melt more than other PGEs, it increases in the crust over time.}, which produces an excess of 187Os. The combined input of the two sources to the marine environment results in the observed ratio in the oceans, and has fluctuated over the geologic history. These changes in the isotopic values of marine Os can be observed in the marine sediment that is deposited, and eventually lithified in that time period. This allows for researchers to estimate weathering fluxes, flood basalt volcanism, and impact events that may have caused some of our largest mass extinctions. The marine sediment Os isotope record has corroborated the K-T boundary impact, for example.
3 August – Dogxim, the now-dead first known hybrid of a fox and a domesticated dog, discovered in the wild in Brazil in 2021, is reported. 8 August Walking more than 3,967 steps each day is shown to reduce the risk of dying prematurely of any cause, based on a study of 226,000 people around the world. This is considerably less than previous recommendations, which have sometimes cited a figure of 10,000+ steps being needed each day. A study shows activating astrocyte cells in mice with a novel technique makes them stay awake for much longer without making them sleepier or impacting cognition-associated EEG markers. 10 August – Scientists at Fermilab report the most precise measurement yet of the magnetic moment of the muon. The particles are shown to wobble faster than predicted by the Standard Model, hinting at a possible fifth fundamental force. 11 August The rise in photosynthesis rates around the world caused by the increase of carbon dioxide is found to have slowed dramatically in the 21st century, as the atmosphere has grown drier. A global consortium releases two studies and a database on DNA methylation profiles across 348 mammalian species for use in epigenetic clocks. They provide various new results relating to human aging and animal experiments as well as predictive models that can estimate mammalian tissue age or risk with high accuracy. On 16 August, a study indicates chest radiographs evaluated using AI could be a performant biomarker for aging clocks.
== Classification == Surfactants are compounds with hydrophilic "heads" and hydrophobic "tails." The "heads" of surfactants are polar and may or may not carry an electrical charge. The "tails" of most surfactants are fairly similar, often consisting of a hydrocarbon chain (linear or branched) and may comprise aromatic units. Most commonly, surfactants are classified according to the polarity of their head group: A non-ionic surfactant has no charged groups in its head. The head of an ionic surfactant carries a net positive, or negative, charge. If the charge is negative, the surfactant is more specifically called anionic; if the charge is positive, it is called cationic. If a surfactant contains a head with two oppositely charged groups, it is termed zwitterionic, or amphoteric.
=== Pharmacokinetics === Ketamine can be absorbed by many different routes due to its water and lipid solubility. Intravenous ketamine bioavailability is 100% by definition, intramuscular injection bioavailability is slightly lower at 93%, and epidural bioavailability is 77%. Subcutaneous bioavailability has never been measured but is presumed to be high. Among the less invasive routes, the intranasal route has the highest bioavailability (45–50%) and oral – the lowest (16–20%). Sublingual and rectal bioavailabilities are intermediate at approximately 25–50%. After absorption ketamine is rapidly distributed into the brain and other tissues. The plasma protein binding of ketamine is variable at 23–47%.
The first description of the use of GH as a doping agent was Dan Duchaine's "Underground Steroid handbook" which emerged from California in 1982; it is not known where and when GH was first used this way. Athletes in many sports have used human growth hormone in order to attempt to enhance their athletic performance. Some recent studies have not been able to support claims that human growth hormone can improve the athletic performance of professional male athletes. Many athletic societies ban the use of GH and will issue sanctions against athletes who are caught using it. However, because GH is a potent endogenous protein, it is very difficult to detect GH doping. In the United States, GH is legally available only by prescription from a medical doctor.
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.
Legality depends on the country and the intended use. In many places it is sold as a research chemical, but sports and medicine regulations restrict it.