Using CC(C)(C)OC(=O)c1cc(F)c(Oc2cnc(OCC3CC(F)(F)C3)c(Cl)c2)cc1F to produce O=C(O)c1cc(F)c(Oc2cnc(OCC3CC(F)(F)C3)c(Cl)c2)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.