Using COC(=O)c1c(Cl)cc(Br)cc1CBr, NCC1CCC(F)(F)CC1 to produce O=C1c2c(Cl)cc(Br)cc2CN1CC1CCC(F)(F)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.