(1aR,9aS)-9alpha-[(S)-1,2-二羟基-1-甲基乙基]-1abeta,1balpha,3a,3balpha,4,4abeta,5abeta,5b-八氢-4beta-羟基-3aalpha,5bbeta-二甲基-3H,7H-环氧乙烷并[i]环氧乙烷并[5,6]异苯并呋喃并[7,1-fg][2]苯并吡喃-3,7-二酮
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