Using CCOCc1cc(OC)c(-c2ccc(C[C@H](NC(=O)c3c(Cl)cccc3Cl)C(=O)OCC)cc2)c(OC)c1, BrC(Br)(Br)Br to produce CCOC(=O)[C@H](Cc1ccc(-c2c(OC)cc(CBr)cc2OC)cc1)NC(=O)c1c(Cl)cccc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.