Showing structure for (1s,4ar,5s,6r,6ar,7s,11as,11bs)-1,5-bis(acetyloxy)-4a,6-dihydroxy-4,4,11b-trimethyl-1h,2h,3h,5h,6h,6ah,7h,11h,11ah-phenanthro[3,2-b]furan-7-carboxylic acid