(16alpha)-3,16-Bis(acetyloxy)estra-1,3,5(10)-trien-17-one 1247-71-8 16alpha-Hydroxyestron-diacetat 3,16alpha-Dihydroxyestra-1,3,5(10)-trien-17-one 3,16-diacetate Colpogynon Colpormon EINECS 214-997-7