Using c1ccc2c(c1)NCCO2, O=C(O)c1cccnc1Oc1cc(Cl)ccc1Cl to produce O=C(c1cccnc1Oc1cc(Cl)ccc1Cl)N1CCOc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.