9bβ-methyl-2,3,3aβ,3bα,4,5,7,8,9,9aα,9bα,10,11,11aβ-tetradecahydrophenanthro<2,1-b>furan-7-one

1-Methoxycarbonylmethyl-2-oxo-4a-methyl-7-methoxy-2,3,4,4a,9,10-hexahydro-phenthren