17alpha dihydroequilin and its Impurities

17α-Dihydroequilin, or α-dihydroequilin, also known as 7-dehydro-17α-estradiol, as well as estra-1,3,5(10),7-tetraene-3,17α-diol, is a naturally occurring steroidal estrogen found in horses which is closely related to equilin, equilenin, and 17α-estradiol. Reference standards of 17Alpha Dihydroequilin API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.