CAS No.17916-75-5 Nomen chemicum:Estr-5-in-17-one, 3-hydroxy-, (3b)- SynonymsEstr-5-en-17-one, 3-hydroxy-, (3b)-;(3S,8R,9S,10R,13S,14S)-3-hydroxy-13-methyl-1,2,3,4,7,8,9,10,11,12,13,14,15,16-tetradecahydro-17H-cyclopenta[a]phenanthren-unum CBNumber:CB43060652 Formulae hypotheticae:C18H26O2 Formulae Pondus:274.4