(1S,2R,3S,3aS,4R,6aR,7aR,7bR,8S,10aS,11R,11aR)- 3-(1,1-二甲基乙基)六氢-2,4,7b,11-四氢-8-甲基-9H-1,7a-(环氧甲桥)-1H,6aH-环戊[c]呋喃[2,3-b]呋喃[3′,2′:3,4]环戊[1,2-d]呋喃-5,9,12(4H)-三酮 15291-76-6