[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is an alpha-amino-acid cation. It is a conjugate acid of a histidinium(1+)."}, {"from": "gpt", "value": "[C][=C][Branch1][=Branch1][N][C][=NH1+1][Ring1][Branch1][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][NH3+1]"}]