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    甲基碘
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    8-methoxy-3,7-dimethyl-3,7-dihydro-purine-2,6-dione
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    7-acetyl-3,9-dimethyl-uric acid
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    硫酸二甲酯
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    8-chloro-3,7-dimethyl-3,7-dihydro-purine-2,6-dione
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