Using O=C1OC(=O)c2cc(F)ccc21, Oc1ccccc1C(F)(F)F to produce O=C1OC(=O)c2cc(Oc3ccccc3C(F)(F)F)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.