Using O=C(Cl)CCCCBr, Nc1nc2c(s1)CCCc1ccc(F)cc1-2 to produce O=C(CCCCBr)Nc1nc2c(s1)CCCc1ccc(F)cc1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.