[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is an S-conjugate L-cysteinylglycine zwitterion substituted by a benzyl group; major species at pH 7.3."}, {"from": "gpt", "value": "[C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][S][C][C@@H1][Branch1][N][C][=Branch1][C][=O][N][C][C][=Branch1][C][=O][O-1][NH3+1]"}]