dimethyl 2,3-dihydroxy-2-butenedioate
dimethyl 2,3-dihydroxy-2-butenedioate ??
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dimethyl 2,3-dihydroxy-2-butenedioate C??? ??, ??, ??
dimethyl 2,3-dihydroxy-2-butenedioate ?? ?? ? ???
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dimethyl 2,3-dihydroxy-2-butenedioate ?? ??
???( 1)?? ??