[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is an ammonium betaine that is the conjugate base of 3-dehydrocarnitinium; major species at pH 7.3. It has a role as a human metabolite. It is a conjugate base of a 3-dehydrocarnitinium."}, {"from": "gpt", "value": "[C][N+1][Branch1][C][C][Branch1][C][C][C][C][=Branch1][C][=O][C][C][=Branch1][C][=O][O-1]"}]