[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is major species at pH 7.3"}, {"from": "gpt", "value": "[C][Branch1][#Branch2][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][S][S][C][C][=Branch1][C][=O][C][=Branch1][C][=O][O-1]"}]