Showing structure for methyl (4as,5r,6r,6ar,7s,11as,11br)-6-(acetyloxy)-5-hydroxy-4,4,11b-trimethyl-1h,2h,3h,4ah,5h,6h,6ah,7h,11h,11ah-phenanthro[3,2-b]furan-7-carboxylate