(2-alpha,5-alpha,17-alpha)-2-Ethynyl-A,19-dinorpregn-20-yne-2,17-diol 64675-09-8 A,19-Dinorpregn-20-yne-2,17-diol, 2-ethynyl-, (2-alpha,5-alpha,17-alpha)- Dinordrin I (free alcohol)