Estradiol Valerate EP Impurity F Catalogue C206536 CAS 18069-79-9 M.W 342.48 M.F C22H30O3 Specifications FAQs (8R,9S,13S,14S,17S)-3-hydroxy-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl butyrate