Using O=C(CCc1c(Br)cc(Br)nc1-c1ccc(F)cc1Cl)Nc1c(Cl)cccc1Cl to produce O=C1CCc2c(cc(Br)nc2-c2ccc(F)cc2Cl)N1c1c(Cl)cccc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.