[{"from": "human", "value": "Provide a description of this molecule. [C][N][C][=C][Branch1][#Branch2][C][=Branch1][C][=O][N][=C][Ring1][#Branch1][N][N][C][=N][Ring1][#Branch2]"}, {"from": "gpt", "value": "The molecule is a 3-methylguanine that is 3,7-dihydro-6H-purin-6-one substituted by an amino group at position 2 and a methyl group at position 3. It is a tautomer of a 2-amino-3-methyl-3,9-dihydro-6H-purin-6-one and a 2-imino-3-methyl-1,2,3,9-tetrahydro-6H-purin-6-one."}]