Using [F-], CCCCCCCCOc1ccc(-c2ccc(CCCCCCCC)c(Cl)n2)cc1 to produce CCCCCCCCOc1ccc(-c2ccc(CCCCCCCC)c(F)n2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.