Using O=C1CCC(=O)N1Br, O=C1N(c2ccc(F)cc2)CCc2nc(COc3ccccc3)cn21 to produce O=C1N(c2ccc(F)cc2)CCc2nc(COc3ccccc3)c(Br)n21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.