SR 12813

≥98%, solid

Tetraethyl 2-(3,5-di-tert-butyl-4-hydroxyphenyl)ethenyl-1,1-bisphosphonate
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
MDL number:
PubChem Substance ID:

biological source

synthetic (organic)

Quality Level






DMSO: ≥10 mg/mL
H2O: insoluble



SMILES string




InChI key



SR-12813 was used as control in pregnane X receptor (PXR) binding assay performed in HepG2 liver carcinoma cells and PXR-activation assay mediated by dehydroepiandrosterone in human hepatocytes.


1, 5 mg in glass bottle

Biochem/physiol Actions

SR-12813 is a 1,1-bisphosphonate ester that exhibits hypocholesterolemic activity. It decreases the biosynthesis of cholesterol by enhancing the degradation of HMG-CoA reductase.
SR 12813 is a pregnane X receptor (PXR, NR 112) agonist; cholesterol lowering drug; HMGCoA reductase inhibitor.

Features and Benefits

This compound was developed by GlaxoSmithKline. To browse the list of other pharma-developed compounds and Approved Drugs/Drug Candidates, click here.
This compound is a featured product for Gene Regulation research. Click here to discover more featured Gene Regulation products. Learn more about bioactive small molecules for other areas of research at sigma.com/discover-bsm.


11 - Combustible Solids

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

Krisztina Kohalmy et al.
Drug metabolism and disposition: the biological fate of chemicals, 35(9), 1495-1501 (2007-06-27)
Dehydroepiandrosterone (DHEA), the major precursor of androgens and estrogens, has several beneficial effects on the immune system, on memory function, and in modulating the effects of diabetes, obesity, and chemical carcinogenesis. Treatment of rats with DHEA influences expression of cytochrome...
Marija Pinne et al.
PloS one, 11(10), e0164642-e0164642 (2016-10-13)
The pregnane X receptor (PXR/SXR, NR1I2) and constitutive androstane receptor (CAR, NR1I3) are nuclear receptors (NRs) involved in the regulation of many genes including cytochrome P450 enzymes (CYPs) and transporters important in metabolism and uptake of both endogenous substrates and...
Zdeněk Dvořák et al.
EMBO molecular medicine, 12(4), e11621-e11621 (2020-03-11)
The human PXR (pregnane X receptor), a master regulator of drug metabolism, has essential roles in intestinal homeostasis and abrogating inflammation. Existing PXR ligands have substantial off-target toxicity. Based on prior work that established microbial (indole) metabolites as PXR ligands...
T A Berkhout et al.
The Journal of biological chemistry, 271(24), 14376-14382 (1996-06-14)
SR-12813 (tetra-ethyl 2-(3,5-di-tert-butyl-4-hydroxyphenyl)ethenyl-1, 1-bisphosphonate) lowers plasma cholesterol in five species. In this paper we investigate the underlying mechanism using Hep G2 cells. SR-12813 inhibited incorporation of tritiated water into cholesterol with an IC50 of 1.2 microM but had no effect...
Navdar Sever et al.
The Journal of biological chemistry, 279(41), 43136-43147 (2004-07-13)
Insig-1 and Insig-2 are membrane proteins of the endoplasmic reticulum that regulate lipid metabolism by the following two actions: 1) sterol-induced binding to 3-hydroxy-3-methylglutaryl-coenzyme A reductase, an action that leads to ubiquitination and degradation of the enzyme; and 2) sterol-induced...
The amount of cholesterol that is synthesized in the liver is tightly regulated by dietary cholesterol levels. LDL receptors regulate the cellular transport of lipid rich low density lipoprotein (LDL) particles.
Read More
Randomized controlled clinical studies have suggested 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors (statins) are effective in both primary and secondary prevention of cardiovascular disease (CVD) events.
Read More
Related Content
We offer a variety of small molecule research tools, such as transcription factor modulators, inhibitors of chromatin modifying enzymes, and agonists/antagonists for target identification and validation in gene regulation research; a selection of these research tools is shown below.
Read More

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service