Using O=C1CCC(=O)N1Br, COC(=O)c1cc(-c2cnn(C)c2)c2ccc(C)c(F)c2n1 to produce COC(=O)c1cc(-c2cnn(C)c2)c2ccc(CBr)c(F)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.