Using c1cc(OCC2CO2)c2ccoc2c1, O=C(CCNCc1ccccc1)NCc1ccccc1 to produce O=C(CCNCC(O)COc1cccc2occc12)NCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.