Ethinylestradiol EP Impurity H Catalogue C206538 CAS 1350468-76-6 M.W 310.40 M.F C20H22O3 Specifications FAQs (8R,9S,13S,14S,17R)-17-ethynyl-3,17-dihydroxy-13-methyl-6,7,8,9,11,12,13,14,15,17-decahydro-16H-cyclopenta[a]phenanthren-16-one