Using Cn1c(=O)c(C(=O)O)cc2cnnc(-c3ccc(F)cc3F)c21, O=C1CCC(=O)N1Br to produce Cn1c(=O)c(Br)cc2cnnc(-c3ccc(F)cc3F)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.