Using O=c1c2cc(Br)ccc2oc2c([N+](=O)[O-])cc(Cl)nc12, [F-] to produce O=c1c2cc(Br)ccc2oc2c(F)cc(Cl)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.