Using O=C1CCC(=O)N1Br, CCOC(=O)C(c1ccc(C)cc1)C(C)C(F)(F)F to produce CCOC(=O)C(c1ccc(CBr)cc1)C(C)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.