(2aR*,5S*,6aS*,8aS*,E)-Ethyl 5-hy-droxy-7,7,8a-trimethyl-8-oxo-2,2a,6,6a,7,8,8a,8b-octa-hydro-1H-penta-leno[1,6-bc]oxepine-4-carboxyl-ate.

(2aR*,5S*,6aS*,8aS*,E)-Ethyl 5-hy-droxy-7,7,8a-trimethyl-8-oxo-2,2a,6,6a,7,8,8a,8b-octa-hydro-1H-penta-leno[1,6-bc]oxepine-4-carboxyl-ate.