17-Ethynyl-(5a)-androst-2-ene-17-ol-17-nicotinate 17alpha-Ethynyl-(5a)-androst-2-ene-17beta-ol-17beta-nicotinate 60834-44-8 Pregn-2-en-20-yn-17-ol, 3-pyridinecarboxylate, (5alpha,17alpha)-