Using O=C1CCC(=O)N1Br, Nc1ncccc1-c1nc2cnccc2n1-c1cccc(F)c1F to produce Nc1ncc(Br)cc1-c1nc2cnccc2n1-c1cccc(F)c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.