Showing structure for (4s,4ar,5s,8ar,9as)-4-{2-[(2z,8s,8ar)-8,8a-dimethyl-3-oxo-5,6,7,8-tetrahydro-1h-naphthalen-2-ylidene]propanoyl}-9a-hydroxy-3,4a,5-trimethyl-4h,5h,6h,7h,8h,8ah,9h-naphtho[2,3-b]furan-2-one