Using CCOC(=O)c1ccc(OC(F)F)c2oc3c(=O)n(-c4ccc(Cl)cc4)ncc3c12 to produce O=C(O)c1ccc(OC(F)F)c2oc3c(=O)n(-c4ccc(Cl)cc4)ncc3c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.