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3a-acetyl-2,2-dimethyl-5-oxo-3,4,6,6a-tetrahydro-1H-pentalene-1-carbaldehyde 3a-acetyl-5-keto-2,2-dimethyl-3,4,6,6a-tetrahydro-1H-pentalene-1-carbaldehyde 3a-ethanoyl-2,2-dimethyl-5-oxo-3,4,6,6a-tetrahydro-1H-pentalene-1-carbaldehyde 3a-acetyl-2,2-dimethyl-5-oxo-3,4,6,6a-tetrahydro-1H-pentalen-1-carbaldehyd 3a-acétyl-2,2-diméthyl-5-oxo-3,4,6,6a-tetrahydro-1H-pentalène-1-carbaldéhyde 3a-アセチル-2,2-ジメチル-5-オキソ-3,4,6,6a-テトラヒドロ-1H-ペンタレン
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