Using C1=Cc2ccccc2C1, FC(F)(F)c1cc(I)cc(C(F)(F)F)c1 to produce FC(F)(F)c1cc(C2=Cc3ccccc3C2)cc(C(F)(F)F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.