Using CCOC(=O)C(=O)Nc1cc(Br)c(OCc2cccc(Br)c2)c(Br)c1 to produce O=C(O)C(=O)Nc1cc(Br)c(OCc2cccc(Br)c2)c(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.