(1S,2R,4a'S,5'S,6S,7'R,9a'S)-6-(乙酰氧基)-5'-羟基-3,3-二甲基-8'-甲亚基-1',9'-二羰基六氢螺[环己烷-1,4'-[2]氧杂[7,9a]亚甲基环庚三烯并[c]吡喃]-2-羧酸
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