(4R,4aR,7S,8S,11S)-4-(3-呋喃基)-4,4a,5,6,6a,7,8,9,10,11,12,12a-十二氢-4a,7,9,9-四甲基-2,10,13-三氧代-7,11-甲桥-2H-环辛四烯并[f][2]苯并吡喃-8-乙酸甲酯
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