Estradiol Valerate EP Impurity G Catalogue C206537 CAS 1313382-25-0 M.W 354.49 M.F C23H30O3 Specifications FAQs (8R,9S,13S,14S,17S)-3-hydroxy-13-methyl-8,9,12,13,14,15,16,17-octahydro-11H-cyclopenta[a]phenanthren-17-yl pentanoat