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    富马酸单甲酯
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    methyl 4-hydroxybut-2-enoate
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    methyl 4-(4-methylanilino)-4-oxobut-2-enoate
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    methyl 4-anilino-4-oxobut-2-enoate
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    methyl 4-(4-methylanilino)-4-oxobutanoate
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