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3-Maleylpyruvic acid, or 3-maleylpyruvate, is a dicarboxylic acid formed by the oxidative ring opening of gentisic acid by gentisate 1,2-dioxygenase during the metabolism of tyrosine. It is converted into 3-fumarylpyruvate by maleylpyruvate isomerase.
References
3-Maleylpyruvic acid Wikipedia(Text) CC BY-SA