The short version of certificate of analysis fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-04-17. Anything still debated is marked as such rather than presented as settled.
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.
At the molecular level, SR9009 binds the ligand-binding domain of REV-ERB and strengthens recruitment of corepressor proteins such as NCoR and HDAC3. This increases repression of target genes, including Bmal1 and other clock-controlled and metabolic genes. In rodent studies, such changes have been linked to altered lipid handling, glucose metabolism, and energy expenditure. The precise chain of events between receptor binding and whole-body effects remains an active area of research. Findings in animals do not automatically translate to humans.
Laboratory studies often administer SR9009 by injection because oral absorption appears poor in rodents. Reported pharmacokinetic properties include rapid metabolism and low systemic exposure after oral dosing. Human pharmacokinetic data are sparse, so absorption, distribution, metabolism, and excretion in people are not well defined. Some research explores related REV-ERB compounds with improved drug-like properties. Regulatory approval for any REV-ERB agonist as a human medicine has not been granted to date.
| 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. |
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.
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.
SR9009 binds REV-ERB receptors and alters their repressive activity on target genes. This action can change transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. In rodent studies, treated animals have shown changes in muscle oxidative capacity and exercise performance, though effects vary by dose, duration, and model. The precise molecular steps connecting receptor binding to whole-body outcomes are still an active area of investigation. Findings in animals do not automatically translate to humans.
Because REV-ERB receptors are core clock components, SR9009 has been examined for effects on daily rhythms as well as metabolism. Research has explored whether the compound can shift or reinforce circadian gene expression in tissues such as liver and muscle. Some studies report improved metabolic markers in obese or diabetic mice, while others show context-dependent responses. Questions remain about which effects are direct, which are secondary to timing, and how they might differ across species.
SR9009 is a synthetic small molecule studied as an agonist of REV-ERB nuclear receptors. REV-ERB alpha and REV-ERB beta help regulate circadian rhythms and metabolic gene expression. In laboratory research, SR9009 has been used to probe how these receptors affect skeletal muscle, liver, and adipose tissue. The compound was identified in academic drug-discovery work and is often described in scientific literature by its chemical name and research code. It is not an approved medicine, and human clinical data remain limited or absent.
===== Authoritarian governance ===== AI tools make it easier for governments to efficiently control their citizens and can increase digital authoritarianism and political repression. Face and voice recognition allow widespread surveillance. Machine learning, operating this data, can classify potential enemies of the state and prevent them from hiding. Recommendation systems can precisely target propaganda and misinformation for maximum effect. Deepfakes and generative AI aid in producing misinformation. Advanced AI can make authoritarian centralised decision-making more competitive than liberal and decentralised systems such as markets. It lowers the cost and difficulty of digital warfare and advanced spyware. AI facial recognition systems are already being used for mass surveillance in China.
(2026) report new mitogenomes of at least 7 Neanderthal individuals from the Stajnia Cave (Poland), interpreted as likely dating to Marine Isotope Stage 5, find that the studied individual carried mitochondrial DNA lineages related to those Western Europe and the northern Caucasus, and interpret their findings as possible evidence of a widespread mitochondrial DNA lineage that was subsequently replaced by the mtDNA found in late Neanderthals. Evidence of exploitation of European pond turtles by Neanderthals occupying the Neumark-Nord site (Germany) during the Last Interglacial is presented by Gaudzinski-Windheuser et al. (2026). Palancar et al. (2026) provide evidence of a clear morphological distinction between axes of Neanderthals and modern humans on the basis of the study of a Neanderthal axis from the Sidrón Cave (Spain). Evidence from the study of metacarpal remains from the Sidrón Cave indicative of differences of metacarpal morphology of Neanderthals and modern humans is presented by Rosas et al. (2026). Rodrigo et al. (2026) provide evidence from the study of animal remains from the Fumane Cave (Italy) indicative of a structured subsistence strategy of Neanderthals occupying the site, including processing of carcasses at kill locations and selective transport of high-yield portions of the carcasses into the cave for secondary processing. Burke et al.
Embryonic mitochondrial transplant and protofection have been proposed as a possible treatment for inherited mitochondrial disease, and allotopic expression of mitochondrial proteins as a radical treatment for mtDNA mutation load. In June 2018 Australian Senate's Senate Community Affairs References Committee recommended a move towards legalising MRT. Research and clinical applications of MRT were overseen by laws made by federal and state governments. State laws were, for the most part, consistent with federal law. In all states, legislation prohibited the use of MRT techniques in the clinic, and except for Western Australia, research on a limited range of MRT was permissible up to day 14 of embryo development, subject to a license being granted. In 2010, the Hon. Mark Butler MP, then Federal Minister for Mental Health and Ageing, had appointed an independent committee to review the two relevant acts: the Prohibition of Human Cloning for Reproduction Act 2002 and the Research Involving Human Embryos Act 2002. The committee's report, released in July 2011, recommended the existing legislation remain unchanged Currently, human clinical trials are underway at GenSight Biologics (ClinicalTrials.gov # NCT02064569) and the University of Miami (ClinicalTrials.gov # NCT02161380) to examine the safety and efficacy of mitochondrial gene therapy in Leber's hereditary optic neuropathy.
Diplomatic Service and Overseas List Bathsheba Abse, Curator, Keats–Shelley Memorial House, Rome. Duncan Bnerton Allan, Second Secretary, British Embassy, Moscow. Jean Armstrong del Bianco. For services to British cultural interests in Venice. Au Chi-lau, . For services to civil engineering in Hong Kong. Christopher Rodney Baker, Honorary Consul, Dunkirk. Sigrid Geraldine Wells Barnes. For charitable services in the Falkland Islands. Janet Bershers, British Vice-Consul, Chicago. Kenneth Geoffrey Birch, British Vice-Consul, Zurich. John Basil Boursot. For services to zoology in El Salvador. Chan Kim-to. For public service, Hong Kong. Chan Kong-sang. For public service, Hong Kong. Peter Chau Cham-chiu, , Assistant Commissioner (Auxiliary), Royal Hong Kong Police Force. Maureen Anne Chesterton, British Vice-Consul, Lima. Michael Chik Wah-wai, Assistant Commissioner, Customs and Excise, Hong Kong. Mary Matilda Cooper, . For services to nursing and welfare, Montserrat. Nicola Jane Crews. For services to disabled people, Indonesia. Brendan William Laurence Egan. For services to the British School, Manila. Margaret Elsworth. For services to education and health, South Africa. John Barrymore Eustice. For services to disabled people, Botswana. The Reverend Father Anthony Fleming. For charitable and welfare services to the community in Orissa, India. Frank Charles Gamble, Director, British Red Cross Society, Bermuda. Christopher Garratt. For services to the British community in Brussels. Martin Fraser Gibson. For services to the British community in Uruguay.
Sources: en.wikipedia.org
=== 27 April === A Moscow court fined the Wikimedia Foundation, the hosting platform for Wikipedia, two million roubles. This is the seventh fine since 2023 by a Russian court. The latest fine was for a failure to remove an article from Wikipedia that contains "classified military information" about the war in Ukraine. Russian digital affairs minister Maksut Shadaev told Interfax "We are not blocking Wikipedia yet, there are no such plans for now." Jens Stoltenberg, Secretary General of NATO, announced that since the start of the war NATO had provided Ukraine with anti-aircraft weapon systems, some MiG-29 aircraft, 230 tanks and 1550 other armored vehicles, which makes up 98% of the previously promised aid in armored vehicles. He said that NATO had trained enough Ukrainians to assemble 9 new armored brigades, which put Ukraine in a strong position to recapture occupied territories. Melitopol's chief of police, Oleksandr Mishchenko, was killed by an Improvised explosive device. He had been collaborating with the Russian forces since they captured the city. Another police officer was killed and one more wounded. The attack was blamed on Ukrainian partisans. It was reported that a military projectile had been discovered in a forest close to the village of Zamosc near Bydgoszcz, Poland. It was later identified as a Russian Kh-55 missile. According to Finnish Foreign Minister Pekka Haavisto, the Russian Central Bank had frozen the bank accounts of the Finnish Embassy in Moscow and the Finnish consulate in Saint Petersburg.
== Comparison to basic research or applied research == Basic research is the systematic study directed toward greater knowledge or understanding of the fundamental aspects of phenomena and is performed without thought of practical ends. It results in general knowledge and understanding of nature and its laws. For instance, basic biomedical research focuses on studies of disease processes using, for example, cell cultures or animal models without consideration of the potential utility of that information. Applied research is a form of systematic inquiry involving the practical application of science. It accesses and uses the research communities' accumulated theories, knowledge, methods, and techniques, for a specific, often stated, business, or client-driven purpose. Translational research forms a subset of applied research. In life-sciences, this was evidenced by a citation pattern between the applied and basic sides in cancer research that appeared around 2000. In fields such as psychology, translational research is seen as a bridging between applied research and basic research types. The field of psychology defines translational research as the use of basic research to develop and test applications, such as treatment.
== Hazards == Bottles of di-tert-butyl dicarbonate buildup of internal pressure in sealed containers caused by its slow decomposition to di-tert-butyl carbonate and ultimately tert-butanol and CO2 in the presence of moisture. For this reason, it is usually sold and stored in plastic bottles rather than glass ones. The main hazard of the reagent is its inhalational toxicity. Its median lethal concentration of 100 mg/m3 over 4 hours in rats is comparable to that of phosgene (49 mg/m3 over 50 min in rats).
Sources: en.wikipedia.org
One product of fatty acid metabolism are the prostaglandins, compounds having diverse hormone-like effects in animals. Prostaglandins have been found in almost every tissue in humans and other animals. They are enzymatically derived from arachidonic acid, a 20-carbon polyunsaturated fatty acid. Every prostaglandin therefore contains 20 carbon atoms, including a 5-carbon ring. They are a subclass of eicosanoids and form the prostanoid class of fatty acid derivatives. The prostaglandins are synthesized in the cell membrane by the cleavage of arachidonate from the phospholipids that make up the membrane. This is catalyzed either by phospholipase A2 acting directly on a membrane phospholipid, or by a lipase acting on DAG (diacyl-glycerol). The arachidonate is then acted upon by the cyclooxygenase component of prostaglandin synthase. This forms a cyclopentane ring roughly in the middle of the fatty acid chain. The reaction also adds 4 oxygen atoms derived from two molecules of O2. The resulting molecule is prostaglandin G2, which is converted by the hydroperoxidase component of the enzyme complex into prostaglandin H2. This highly unstable compound is rapidly transformed into other prostaglandins, prostacyclin and thromboxanes. These are then released into the interstitial fluids surrounding the cells that have manufactured the eicosanoid hormone. If arachidonate is acted upon by a lipoxygenase instead of cyclooxygenase, hydroxyeicosatetraenoic acids and leukotrienes are formed. They also act as local hormones.
Le Havre appears in several literary works as a point of departure to America: in the 18th century, Father Prevost embarked Manon Lescaut and Des Grieux for French Louisiana. Fanny Loviot departed from Le Havre in 1852, as an emigrant to San Francisco and points further west, and recounted her adventures in Les pirates chinois (A Lady's Captivity among Chinese Pirates in the Chinese Seas, 1858). In the 19th century, Le Havre was the setting for several French novels: Honoré de Balzac described the failure of a Le Havre merchant family in Modeste Mignon. Later, the Norman writer Guy de Maupassant located several of his works at Le Havre such as Au muséum d'histoire naturelle (At the Museum of Natural History) a text published in Le Gaulois on 23 March 1881 and again in Pierre et Jean. Alphonse Allais located his intrigues at Le Havre too. La Bête humaine (The Human Beast) by Émile Zola evokes the world of the railway and runs along the Paris–Le Havre railway. Streets, buildings, and public places in Le Havre pay tribute to other famous Le Havre people from this period: the writer Casimir Delavigne (1793–1843) has a street named after him and a statue in front of the palace of justice alongside another man of letters, Bernardin de Saint-Pierre (1737–1814). In the 20th century, Henry Miller located part of the action in Le Havre in his masterpiece Tropic of Cancer, published in 1934. Bouville was the commune where the writer lived who wrote his diary in La Nausée (The Nausea) (1938) by Jean-Paul Sartre who was inspired by Le Havre city where he wrote his first novel.
=== Homologous recombination === Another method of cloning without the use of ligase is by DNA recombination, for example as used in the Gateway cloning system. The gene, once cloned into the cloning vector (called entry clone in this method), may be conveniently introduced into a variety of expression vectors by recombination.
{\displaystyle \mathrm {Purity} ={\frac {w_{\mathrm {std} }\times n[\mathrm {H} ]_{\mathrm {std} }\times MW_{\mathrm {spl} }}{w_{\mathrm {spl} }\times MW_{\mathrm {std} }\times n[\mathrm {H} ]_{\mathrm {spl} }}}\times P}
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.
SR9009 is a synthetic research compound that activates the REV-ERBα and REV-ERBβ nuclear receptors. It is not an approved drug and has no established human therapeutic use. Most published biological data come from cell and rodent studies.