An organic compound, which has antiandrogen and PPARγ-modulating properties. It is used as a constituent of epoxy resin. Synthesized by O-alkylation of bisphenol A with epichlorohydrin. It a potential endocrine disruptor and a carcinogen. Reference standards of Bisphenol A API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.