USP Standards - 6Beta-Hydroxy Ethinyl Estradiol (25 mg) ((6R,8R,9S,13S,14S,17R)-17-ethynyl-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthrene-3,6,17-triol), CAS : 56324-28-8, HS:2907290500 PN: 1A00110