Using COC(=O)CCn1c(=O)c2c(C)c(-c3ccc(Cl)cc3)sc2n(C)c1=O, O=C1CCC(=O)N1Br to produce COC(=O)CCn1c(=O)c2c(CBr)c(-c3ccc(Cl)cc3)sc2n(C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.