1H-2,5-Ethanoindeno[4,5-e]oxecin-3,11-dione,5,6,7,8,8a,10a,12,13,13a,13b-decahydro-7,15-dihydroxy-12-methyl-1-(2-oxopropyl)-,(1S,5R,7R,8aS,10aS,12R,13aR,13bS)-