18,19-Dinorandrosta-1,3,5(10)-trien-17-one, 3-methoxy- 18-Norestrone methyl ether 3-Methoxygona-1,3,5(10)-trien-17-one 4147-10-8 Gona-1,3,5(10)-trien-17-one, 3-methoxy-