15-Oxa-3-(cyclopentyloxy)-1,3,5(10)-estratrien-17-one 15-Oxaestra-1,3,5(10)-trien-17-one, 3-(cyclopentyloxy)- 3-(Cyclopentyloxy)-15-oxaestra-1,3,5(10)-trien-17-one 49849-07-2 BRN 5609796