[{"from": "human", "value": "Describe this molecule. [C][Branch1][=Branch2][C][C][NH1+1][=C][Branch1][C][N][N][C][NH1+1][=C][Branch1][C][N][N]"}, {"from": "gpt", "value": "The molecule is dication of 1,4-diguanidinobutane arising from deprotonation of both guanidino groups; major species at pH 7.3. It is a conjugate acid of a 1,4-diguanidinobutane."}]