19-Nor-17-alpha-pregna-1,3,5(10)-trien-20-yne, 21-bromo-3,17-dimethoxy- 19-Norpregna-1,3,5(10)-trien-20-yne, 21-bromo-3,17-dimethoxy-, (17-alpha)- (9CI) 21-Bromo-3,17-dimethoxy-19-nor-17-alpha-pregna-1,3,5(10)-trien-20-yne 7548-46-1 BDH 6140 BRN 3002714