[{"from": "human", "value": "Provide a brief overview of this molecule. [C][NH2+1][C][Branch2][Ring1][=Branch1][C][C][C][=N][C][=C][Branch1][Ring2][N][Ring1][Branch1][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is an ammonium ion that is a derivative of L-histidine having a 3-carboxy-3-(methylammonio)propyl group at the 2-position on the imidazole ring. It is a conjugate acid of a 2-[3-carboxylato-3-(methylammonio)propyl]-L-histidine dizwitterion."}]