Using COS(=O)(=O)OC, COC(=O)c1sc2cc(C(F)(F)F)ccc2c1O to produce COC(=O)c1sc2cc(C(F)(F)F)ccc2c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.