Using NCCOc1c(-c2ccc(N3CCCC3)cc2)[nH]c(=O)c2cc(F)ccc12, Br to produce NCCOc1c(-c2ccc(N3CCCC3)c(Br)c2)[nH]c(=O)c2cc(F)ccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.