Using Nc1ccccc1Cl, O=C(Cl)c1cc2c(s1)-c1cc(Br)ccc1OCC2 to produce O=C(Nc1ccccc1Cl)c1cc2c(s1)-c1cc(Br)ccc1OCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.