[{"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."}, {"from": "gpt", "value": "[C][=Branch1][#Branch2][=C][S][=Branch1][C][=O][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1]"}]