(3S,3aS,6S,6aR,6bS,7S,7aR,8S,10aS,11S,13aS,13bR,13cR,14bS)-3,3a,4,5,6,6a,6b,7,7a,8,9,10,10a,13a,13c,14b-Hexadecahydro-6,8-dihydroxy-3,6,8,11,14,15-hexamethyl-2H-7,13b-ethenopentaleno[1'',2'':6,7;5'',4'':6',7']dicyclohepta[1,2-b:1',2'-b']difuran-2,12(11H)-dione
