Using O=C1CCC(=O)N1Br, Cc1nc(C(F)(F)F)ccc1C(=O)C1=C(Cl)C(C)(C)C(=O)C(C)(C)C1=O to produce CC1(C)C(=O)C(C(=O)c2ccc(C(F)(F)F)nc2CBr)=C(Cl)C(C)(C)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.