19-Norpregna-1,3,5(10)-trien-20-yne-3,17-diol, 2,4-dibromo-, (17alpha)- 2,4-Dibromo-17-ethynyl(6,7)estradiol 2,4-Dibromo-17-ethynyl(6,7-3H)estradiol 3H-2,4-Dbee2 79769-52-1