branched-chain keto acid branched-chain keto acid anion BCKA anion CHEBI:191201 branched-chain keto acid anions An oxo carboxylic acid anion that is the conjugate base of branched-chain keto acid resulting from the deprotonation of the carboxy group. branched-chain ketoacid anion branched-chain ketoacid anions BCKA anions oxo carboxylic acid anion