Using O=C(Nc1cnc2ccccc2c1)c1ccc(N2CCNCC2)cc1, O=C(O)Cc1ccccc1 to produce O=C(Nc1cnc2ccccc2c1)c1ccc(N2CCN(C(=O)Cc3ccccc3)CC2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.