If you have been reading about reference standard 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.
Last reviewed on 2026-07-09. Where a claim depends on a specific study, the study is described rather than over-claimed.
SR9009 is generally described as poorly soluble in water and more soluble in organic solvents such as dimethyl sulfoxide and ethanol. Stock solutions are commonly prepared in an organic solvent before dilution into an aqueous buffer or vehicle. Precipitation can occur if the organic fraction is reduced too quickly or if the final concentration exceeds the compound's solubility limit. Sonication or gentle warming may aid dissolution in some protocols, but excessive heat can promote degradation. Container material and pH can also influence observed solubility.
For long-term storage, SR9009 is typically kept as a solid at low temperature, protected from moisture and light. Desiccated conditions limit hydrolysis, while opaque containers reduce photochemical breakdown. Solutions are less stable than solids and are often stored frozen in aliquots to avoid repeated freeze-thaw cycles. Stability data are not standardized across all suppliers, so users should rely on certificate-of-analysis information when available. Degradation may appear as color change, precipitate, or decreased chromatographic purity.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water; stock solutions use organic solvent. |
| Storage | -20°C, desiccated, protected from light | Limits hydrolysis and photodegradation. |
| Analytical method | HPLC-UV/MS | Used for identity and purity assessment. |
| Synonyms | SR9009, Stenabolic | Naming varies by supplier. |
SR9009 is supplied as a solid research chemical, often in milligram quantities. Laboratories typically weigh it in a controlled environment because fine powders can disperse. Stock solutions are commonly prepared in dimethyl sulfoxide and stored in small aliquots to reduce freeze-thaw cycles. Personal protective equipment and chemical fume hoods are standard when handling unknown or potent compounds. These practices address laboratory safety rather than human use.
Identity and purity of SR9009 samples are usually checked with chromatographic and spectrometric methods. High-performance liquid chromatography can separate the compound from related impurities, while mass spectrometry provides molecular mass confirmation. Nuclear magnetic resonance spectroscopy may be used for structural verification in research settings. No single method proves biological activity, and certificates of analysis should be reviewed alongside raw data. Independent testing is often needed because online products vary widely.
SR9009 stability depends on temperature, moisture, light, and solvent. Solid material is generally kept cool and dry, while solutions may require protection from repeated warming and cooling. Degradation can appear as color changes, precipitate, or new chromatographic peaks. Researchers should follow supplier instructions and their own stability data. Long-term storage conditions for human use have not been established because the compound lacks approved clinical formulation.
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.
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.
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.
== Medical uses == In the European Union empagliflozin/metformin is indicated in adults aged 18 years and older with type 2 diabetes mellitus as an adjunct to diet and exercise to improve glycemic control:
Advantages In addition to the kinetic advantages, the reaction relies heavily on small molecules, which are easier to modify and scale. Tetrazine ligations are gaining more importance in various applications, including monitoring lipid modifications, imaging circulating tumor cells, and analyzing glycosylation. Furthermore, they are emerging as highly suitable for click-to-release reactions that are being utilized in regulating enzyme activity and drug delivery.
Wireless networking – automated radio links which transmit digital data between computers and other wireless devices using radio waves, linking the devices together transparently in a computer network. Computer networks can transmit any form of data: in addition to email and web pages, they also carry phone calls (VoIP), audio, and video content (called streaming media). Security is more of an issue for wireless networks than for wired networks since anyone nearby with a wireless modem can access the signal and attempt to log in. The radio signals of wireless networks are encrypted using WPA. Wireless LAN (wireless local area network or Wi-Fi) – based on the IEEE 802.11 standards, these are the most widely used computer networks, used to implement local area networks without cables, linking computers, laptops, cell phones, video game consoles, smart TVs and printers in a home or office together, and to a wireless router connecting them to the Internet with a wire or cable connection. Wireless routers in public places like libraries, hotels and coffee shops create wireless access points (hotspots) to allow the public to access the Internet with portable devices like smartphones, tablets or laptops. Each device exchanges data using a wireless modem (wireless network interface controller), an automated microwave transmitter and receiver with an omnidirectional antenna that works in the background, exchanging data packets with the router.
Sources: en.wikipedia.org
=== Post-World War II === Bektashism continued to flourish until the Second World War. After the communists took power in 1945, several babas and dervishes were executed and a gradual constriction of Bektashi influence began. Ultimately, in 1967 all tekkes were shut down when Enver Hoxha banned all religious practice. When the ban was rescinded in 1990, the Bektashism reestablished itself, although there were few left with any real knowledge of the spiritual path. Nevertheless, many tekkes (lodges) operate today in Albania. The most recent head of the order in Albania was Hajji Dedebaba Reshat Bardhi (1935–2011) and the main tekke has been reopened in Tirana. In June 2011, Baba Edmond Brahimaj was chosen as the head of the Bektashi Order by a council of Albanian babas. Today, sympathy for the Order is generally widespread in Albania where approximately 20% to 25% of Muslims self-report as having some connection to Bektashism. Despite the negative effect of Turkey's ban on lodges on Bektashi life, most contemporary Turkish Bektashis have been generally supportive of the country's Kemalist secularism, since Ataturk's reforms have lessened the religious intolerance historically demonstrated towards the community by the Sunni religious establishment during Ottoman times.
Ideally, the pH of samples should not be modified since it is preferable to test each sample at the original pH level. However, if it is necessary to adjust the pH this should be done by adding either sodium hydroxide solution or hydrochloric acid to the sample. Unlike water samples, soil and sediment samples are not homogeneous. As a result, it is difficult to obtain representative samples from such matrices. Toxic substances are likely to bind to particulate matter, and the extent to which toxic materials bind depends on the composition of the particles. For example, smaller particles such as clay tend to tightly bind to chemicals, acting like ion exchange resins. Microtox tests for sediment and soil differ in the way the matrix is prepared for contact with Allivibrio fischeri. To obtain a representative soil or sediment sample, it is necessary to conduct an elutriate test. Sediment elutriates can be prepared through extraction with either distilled water, saline water, or an organic solvent such as methylene chloride, or hexane. To run an elutriate test a soil sample is mixed with an extractant for a period of time, then allowed to settle and a sample is taken from the extract. If particulate matter is in the sample that was collected, it may be necessary to centrifuge the sample for optimal clarity. Additionally, the pore water of sediments can be collected by centrifugation and tested without extraction.
The rise of railroading during the last half of the 19th century led to the widespread use of pocket watches. A train wreck on the Lake Shore and Michigan Southern Railway in Kipton, Ohio, on April 19, 1891, occurred because one of the engineers' watches had stopped for four minutes. The railroad officials commissioned Webb C. Ball as their Chief Time Inspector, to establish precision standards and a reliable timepiece inspection system for railroad chronometers. This led to the adoption in 1893 of stringent standards for pocket watches used in railroading. These railroad-grade pocket watches, as they became colloquially known, had to meet the General Railroad Timepiece Standards adopted in 1893 by almost all railroads. These standards read, in part:
Sources: en.wikipedia.org
Christopher Hitchens (13 April 1949 – 15 December 2011) was a British and American author, polemicist, debater and journalist who in his youth took part in demonstrations against the Vietnam War, joined organisations such as the International Socialists while at university and began to identify as a socialist. However, after 9/11 he no longer regarded himself as a socialist and his political thinking became largely dominated by the issue of defending civilization from terrorists and against the totalitarian regimes that protect them. Hitchens nonetheless continued to identify as a Marxist, endorsing the materialist conception of history, but believed that Karl Marx had underestimated the revolutionary nature of capitalism. He sympathized with libertarian ideals of limited state interference, but considered libertarianism not to be a viable system. In the 2000 U.S. presidential election, he supported the Green Party candidate Ralph Nader. After 9/11, Hitchens advocated for the invasion of Iraq. In the 2004 election, he very slightly favored the incumbent Republican President George W. Bush or was neutral and in 2008 he favored the Democratic candidate Barack Obama over John McCain despite being critical of both of them.
=== Universities === Nilamber-Pitamber University, India National Penghu University of Science and Technology, Taiwan Northwestern Polytechnical University, China Northwestern Polytechnic University, the former name of San Francisco Bay University, California, United States North Park University, Chicago, Illinois, United States
== Selected publications == Balalaie, S.; Hashtroudi, M. S.; Arabanian, A. (2000). "One-pot synthesis of tetrasubstituted imidazoles catalyzed by zeolite HY and silica gel under microwave irradiation". Green Chemistry. 2 (6): 274–276. doi:10.1039/b006201o. Balalaie, S.; Bararjanian, M.; Amani, A. M.; Movassagh, B. (2006). "(S)-Proline as a neutral and efficient catalyst for the one-pot synthesis of tetrahydrobenzo [b] pyran derivatives in aqueous media". Synlett. 2006 (2): 263–266. doi:10.1055/s-2005-923606. Bararjanian, M.; Balalaie, S.; Rominger, F.; Movassagh, B.; Bijanzadeh, H. R. (2010). "Six-component reactions for the stereoselective synthesis of 3-arylidene-2-oxindoles via sequential one-pot Ugi/Heck carbocyclization/Sonogashira/nucleophilic addition". The Journal of Organic Chemistry. 75 (9): 2806–2812. doi:10.1021/jo902713x. PMID 20387848. Balalaie, S.; Bararjanian, M.; Hosseini, M.S.; Bigdeli, Z. (2006). "One-pot synthesis of 1,4-dihydropyridine derivatives in a solvent-free condition". Helvetica Chimica Acta. 89 (8): 1769–1773. doi:10.1002/hlca.200690161. Balalaie, S.; Sharafi-Kolkesh, A. (2003). "A novel and efficient one-pot synthesis of 2,4,6-triarylpyridines under solvent-free conditions". Zeitschrift für Naturforschung B. 58 (10): 1075–1077. doi:10.1515/znb-2003-1021.
Japan In Japan, dihydrocodeine is available without a prescription; used in cough medicines such as New Bron Solution-ACE. Dihydrocodeine is used as an antitussive in many products as a Dextromethorphan alternative. Medicines in Japan which contain dihydrocodeine are coupled with caffeine to offset the sedative effects and discourage recreational use. Cough medicines containing dihydrocodeine are controlled similarly to dextromethorphan in the United States, in that its sale is strictly limited by purchase quantity and is restricted to persons 20 and older for purchase. United Kingdom In the United Kingdom, dihydrocodeine is a Class B drug; but, it is available over-the-counter in small amounts (less than 8 mg), when combined with paracetamol (see co-dydramol). Dihydrocodeine is listed in Schedule 5 of the Misuse of Drugs Regulations 2001 whereby it is exempt from prohibition on possession provided that it is in the form of a single preparation not being designed for injection and less than 100 mg (calculated as free base) or with a total concentration less than 2.5% (calculated as free base). Illegal possession of dihydrocodeine can result in up to 5 years in prison or an unlimited fine. United States In the US, pure dihydrocodeine is a DEA Schedule II substance, although preparations containing small amounts of dihydrocodeine can also be classified as Schedule III or Schedule V, depending on the concentration of dihydrocodeine relative to other active constituents, such as paracetamol (acetaminophen). The DEA's ACSCN for dihydrocodeine free base and all salts is 9120.
Sources: en.wikipedia.org
Liquid chromatography with mass spectrometry is a common approach. Ultraviolet detection and nuclear magnetic resonance can support identification when suitable standards are available.
The solid is generally kept cold, dry, and protected from light. Solutions are often frozen in single-use aliquots to reduce repeated freeze-thaw cycles.
It indicates a material sold for laboratory study, not for human use. The label does not guarantee pharmaceutical purity, sterility, or regulatory approval.
SR9009 is a synthetic research compound that acts on REV-ERB nuclear receptors. It is not approved for human use and is sold only as a research chemical. Its effects have been studied mainly in cells and rodents.