2,8-Methano-5H-1-benzopyran-5-one,6-benzoyl-2,3,4,4a,8,8a-hexahydro-7,8a-dihydroxy-2-methyl-4a,8-bis(3-methyl-2-butenyl)-3-(3-methyl-3-butenyl)-,[2R-(2a,3a,4ab,8a,8ab)]-