[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a monocarboxylic acid anion resulting from the deprotonation of the carboxy group of 4-sulfanylbutanoic acid. The major species at pH7.3. It is a conjugate base of a 4-sulfanylbutanoic acid."}, {"from": "gpt", "value": "[C][Branch1][#Branch1][C][C][=Branch1][C][=O][O-1][C][S]"}]