[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is major microspecies at pH 7.3. It is a S-substituted L-cysteine and a zwitterion."}, {"from": "gpt", "value": "[C][Branch1][Ring1][C][=O][S][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}]