2-oxopentanedioate 2-KETOGLUTARATE 64-15-3 2-oxoglutarate(2-) alpha-ketoglutarate 2-oxopentanedioic acid, ion(2-) CHEBI:16810 2-Oxoglutamate 4-Carboxy-2-oxo-butyric acid anion 4-Carboxy-2-oxo-butyrate Pentanedioic acid, 2-oxo-, ion(2-) ZINC01532519 c0880 2-oxoglutarate