Using NC=O, O=C(c1ccc(Cl)cc1Cl)C(O)c1ccc(Cl)cc1Cl to produce Clc1ccc(-c2ncoc2-c2ccc(Cl)cc2Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.