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(In full "α-oxoglutaric acid", "2-oxoglutaric acid"), the dicarboxylic keto acid of which 2-oxoglutarate is the anion, also called α-ketoglutaric acid; 2-oxopentanedioic acid, COOH.CO(CH₃)₂ COOH.
1940s; earliest use found in Journal of the American Chemical Society.