Mifepristone, 500 mg

Supplied by STEMCELL Technologies, this small molecule is a progesterone and glucocorticoid receptor antagonist known as Mifepristone (alternative name: RU-486). It is a crystalline solid with the molecular formula C29H35NO2 and a molecular weight of 429.6 g/mol (CAS 84371-65-3). The product is supplied at a reported purity of ≥98% and has been cited in published research relating to leiomyomata, endometriosis, breast cancer, and meningioma.

The compound is soluble in DMSO and absolute ethanol at concentrations of ≤45 mM. STEMCELL Technologies recommends storage at -20°C, protected from prolonged exposure to light. For long-term storage, a desiccant is advised. The product is reported as stable as supplied for 12 months from the date of receipt.

According to the manufacturer's safety data sheet, the substance is classified as Reproductive toxicity Category 1B and carries the hazard statement "May damage fertility or the unborn child." Users are instructed to obtain special instructions before use, wear protective gloves, clothing, eye protection, and face protection, and store the material locked up.