Using NC(CN(CC(CCCC(=O)OCc1ccccc1)NC(=O)OCc1ccccc1)CC(N)C(=O)OCc1ccccc1)C(=O)OCc1ccccc1 to produce NCCN(CCN)CC(N)CCCC(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.