HEXANOIC ACID, ESTERS,(1AR,2S,5R,5AR,6S,8AS,9R,- 10AR)-5-(BENZOYLOXY)-1A,2,5,5A,6,9,10,10AOCTAHYDRO- 5A-HYDROXY-1,1,4,7,9-PENTAMETHYL- 11-OXO-1H-2,8A-METHANOCYCLOPENTA[A]CYCLOPROPA[ E]CYCLODECEN-6-YL ESTER