Estradiol Valerate EP Impurity D Catalogue C206534 CAS 1359847-37-2 M.W 370.53 M.F C24H34O3 Specifications FAQs (8R,9S,13S,14S,17S)-3-hydroxy-4,13-dimethyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl pentanoate