Amino acids are α-aminocarboxylic acid compounds. For the given amino acid, determine the carbonyl compound needed to synthesize it.

Chemical structure of a carbonyl compound related to amino acid synthesis.

Chemical structure of a carbonyl compound with an amine group for amino acid synthesis.

Chemical structure of a carbonyl compound with an amine group and carboxylic acid.

Chemical structure of an amino acid with two carbonyl groups and an amine group.