[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is an optically active form of alpha-aminobutyric acid having L-configuration. It has a role as a human metabolite. It is an alpha-aminobutyric acid and a non-proteinogenic L-alpha-amino acid. It is a conjugate acid of a L-2-aminobutyrate. It is an enantiomer of a D-alpha-aminobutyric acid. It is a tautomer of a L-alpha-aminobutyrate zwitterion."}, {"from": "gpt", "value": "[C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}]