Using CCOCCl, O=c1cc(C(F)(F)F)[nH]c(=O)n1-c1c(Cl)cc(Cl)cc1Cl to produce CCOCn1c(C(F)(F)F)cc(=O)n(-c2c(Cl)cc(Cl)cc2Cl)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.