(5bS,7aS,8R,10aS,10bR)-7a-ethyl-8-ethynyl-8-hydroxy-4,5,5a,5b,6,7,7a,8,9,10,10a,10b,11,12-tetradecahydro-3H-cyclopenta[5,6]naphtho[2,1-c]oxepin-3-one