[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is an N-monosubstituted putrescine where the N-substituent is methyl. It has a role as a mouse metabolite. It is a conjugate base of a N-methylputrescinium(2+)."}, {"from": "gpt", "value": "[C][N][C][C][C][C][N]"}]