(3S,3aS,5aS,6R,9aS,9bS)-N-(3,5-bis(trifluoromethyl)phenyl)-3a,6-dimethyl-6-(3-oxoprop-1-en-1-yl)-2,3,3a,4,5,5a,6,9,9a,9b-decahydro-1H-cyclopenta[a]naphthalene-3-carboxamide