Using O=C1CCC(=O)N1Br, CCOC(=O)c1ccc(Nc2ccccc2N)cc1F to produce CCOC(=O)c1ccc(Nc2cc(Br)ccc2N)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.