ChEBI: 4-methyl-3-oxopentanoic acid is a branched-chain fatty acid that is 4-methylpentanoic acid carrying an oxo substituent at C-3. It is a branched-chain fatty acid and a 3-oxo fatty acid. It is functionally related to a valeric acid. It is a conjugate acid of a 4-methyl-3-oxopentanoate.