[{"from": "human", "value": "Provide a description of this molecule. [C][NH1+1][=C][Branch1][C][N][N]"}, {"from": "gpt", "value": "The molecule is a guanidinium ion that is the conjugate acid of methylguanidine; major species at pH 7.3. It is a conjugate acid of a methylguanidine."}]