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From mes- + (it)aconic acid.
Etymology from Wiktionary, CC BY-SA 4.0.
mesaconic acid
Today it means: one of the isomeric dicarboxylic acids produced by the distillation of citric acid, or as metabolites by microorganisms, trans-CH₃-C(CO₂H)=CHCO₂H; the cis-isomer is citraconic acid Full definition →