(16-alpha)-16-Chloroestra-1,3,5(10)-trien-1-one 16-alpha-Chloroestra-1,3,5(10)-trien-17-one 20377-68-8 ESTRA-1,3,5(10)-TRIEN-17-ONE, 16-alpha-CHLORO- Estra-1,3,5(10)-trien-1-one, 16-chloro-, (16-alpha)- (9CI) SC 9263