Using CS(=O)(=O)OCC(F)(F)F, CCOC(=O)c1ccc(O)c(OC)c1 to produce CCOC(=O)c1ccc(OCC(F)(F)F)c(OC)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.