[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a quaternary ammonium ion. It is a conjugate acid of a 4-(trimethylammonio)but-2-enoate."}, {"from": "gpt", "value": "[C][N+1][Branch1][C][C][Branch1][C][C][C][/C][=C][/C][=Branch1][C][=O][O]"}]