[{"from": "human", "value": "Provide a description of this molecule. [C][N+1][Branch1][C][C][Branch1][C][C][C][/C][=C][/C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a quaternary ammonium ion. It is a conjugate acid of a 4-(trimethylammonio)but-2-enoate."}]