Using COC(=O)C[C@@H]1COc2cc(O[C@@H]3CCc4c3ccc(C(F)(F)F)c4CN3CCOCC3)ccc21 to produce O=C(O)C[C@@H]1COc2cc(O[C@@H]3CCc4c3ccc(C(F)(F)F)c4CN3CCOCC3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.