Using O=C(O)CCNC(=O)C1CCCN(C(=O)COC2CCN(C(=O)OCc3ccccc3)CC2)C1 to produce O=C(O)CCNC(=O)C1CCCN(C(=O)COC2CCNCC2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.