[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a sulfonium betaine. It is a conjugate base of a (carboxymethyl)(dimethyl)sulfonium."}, {"from": "gpt", "value": "[C][S+1][Branch1][C][C][C][C][=Branch1][C][=O][O-1]"}]