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Wiktionary
ketoglutaric acid

n. Either of two ketone derivatives of glutaric acid, α-ketoglutaric acid and β-ketoglutaric acid (the latter varying only by the position of the ketone functional group).

Wikipedia
Ketoglutaric acid

Ketoglutaric acid or oxoglutaric acid may refer to either of two chemical compounds:

  • α-Ketoglutaric acid
  • β-Ketoglutaric acid (acetonedicarboxylic acid)