(2-alpha,5-alpha,17-alpha)-2-Ethynyl-A,19-dinorpregn-20-yne-2,17-diol dipropionate 64675-10-1 A,19-Dinorpregn-20-yne-2,17-diol, 2-ethynyl-, dipropanoate, (2-alpha,5-alpha,17-alpha)- Dinordrin II Dinordrin II dipropionate