[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a primary amino compound and a member of guanidines. It has a role as an Escherichia coli metabolite and a mouse metabolite. It is a conjugate base of an agmatinium(2+)."}, {"from": "gpt", "value": "[C][Branch1][=Branch2][C][C][N][=C][Branch1][C][N][N][C][N]"}]