Using O=C(Cl)OCC(Cl)(Cl)Cl, Nc1cc(-c2nc(-c3ccco3)no2)ccc1Cl to produce O=C(Nc1cc(-c2nc(-c3ccco3)no2)ccc1Cl)OCC(Cl)(Cl)Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.