Using FC(F)(F)C1(F)OC(F)(Cl)C(F)(Cl)OC1(F)C(F)(F)F to produce FC1=C(F)OC(F)(C(F)(F)F)C(F)(C(F)(F)F)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.