(3aR)-3a,4,5,6,7,7a,8,8a-Octahydro-3aβ,7aβ,8aβ-trihydroxy-4α-acetoxy-3,5β,8-trimethyl-2-isopropyl-1H-3bα,8α-(epoxyethano)cyclopent[a]inden-10-one