Using O=C(OCc1ccc(F)cc1)c1cc(C(F)(F)F)ccc1OCc1ccc(F)cc1 to produce O=C(O)c1cc(C(F)(F)F)ccc1OCc1ccc(F)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.