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3a,6a-dimethyltetrahydro-2,5(1H,3H)-pentalenedione 3a,6a-dimethyl-1,3,4,6-tetrahydropentalene-2,5-quinone 3a,6a-dimethyl-1,3,4,6-tetrahydropentalene-2,5-dione 3a,6a-dimethyl-1,3,4,6-tetrahydropentalen-2,5-dion 3a,6a-diméthyl-1,3,4,6-tetrahydropentalène-2,5-dione 3a,6a-ジメチル-1,3,4,6-テトラヒドロペンタレン-2,5-ジオン
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