[{"from": "human", "value": "Describe this molecule. [C][C@@H1][Branch2][Ring2][Branch2][C][Branch2][Ring1][S][C@@][N+1][Ring1][Branch1][=C][Branch2][Ring1][#Branch1][N][C@H1][Branch1][N][C@@H1][Ring1][=Branch1][NH1+1][=C][Branch1][Ring2][N][Ring1][=Branch2][N][C][O][C][=Branch1][C][=O][N][N][Branch1][C][O][O][O]"}, {"from": "gpt", "value": "The molecule is an iminium ion resulting from the protonation of the two imine groups of 11-beta-hydroxysaxitoxin; major microspecies at pH 7.3. It is a pyrrolopurine, an alkaloid, a member of guanidines and an iminium ion."}]