[{"from": "human", "value": "Describe this molecule. [C][N][Branch1][C][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][=Branch1][S][=C][C][=C][C][=Branch1][=Branch1][=N+1][Branch1][C][C][C][C][=C][Ring1][=Branch2][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][N+1][Branch1][C][C][Branch1][C][C][C]"}, {"from": "gpt", "value": "The molecule is an iminium ion that forms the cationic portion of the histological dye 'methyl green'. It is an iminium ion and a quaternary ammonium ion."}]