[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is major microspecies at pH 7.3. It is a conjugate acid of a L-thialysine."}, {"from": "gpt", "value": "[C][Branch1][=N][C][S][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][NH3+1]"}]