Using COS(=O)(=O)OC, O=C(O)c1c(C(F)(F)F)cccc1C(F)(F)F to produce COC(=O)c1c(C(F)(F)F)cccc1C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.