[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a sulfonium betaine obtained by deprotonation of the carboxy group of 3-dimethylsulfoniopropionic acid. It has a role as an osmolyte and a marine metabolite."}, {"from": "gpt", "value": "[C][S+1][Branch1][C][C][C][C][C][=Branch1][C][=O][O-1]"}]