Using CCOC(=O)c1c(C(F)(F)F)nc(C(F)(F)Cl)c(C(=O)OC)c1Cl, OCC(F)(F)F to produce CCOC(=O)c1c(C(F)(F)F)nc(C(F)(F)Cl)c(C(=O)OC)c1OCC(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.