Using BrCCBr, Cn1c(=O)[nH]c2nc(Oc3cccc(OC(F)(F)F)c3)n(Cc3ccc(Cl)cc3)c2c1=O to produce Cn1c(=O)c2c(nc(Oc3cccc(OC(F)(F)F)c3)n2Cc2ccc(Cl)cc2)n(CCBr)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.