[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an imine. It is functionally related to a spermidine. It is a conjugate base of a N-[(E)-4-ammoniobutylidene]propane-1,3-diaminium."}, {"from": "gpt", "value": "[C][Branch1][Branch2][C][C][=N][C][C][C][N][C][N]"}]