Using CCOC(=O)N1CCC(=C2c3ccc(Cl)cc3OCc3cccnc32)CC1, BrBr to produce CCOC(=O)N1CCC(=C2c3cc(Br)c(Cl)cc3OCc3cccnc32)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.