Using O=C(O)Cc1cc(OCc2ccccc2)cc(C(F)(F)F)c1, CO to produce COC(=O)Cc1cc(OCc2ccccc2)cc(C(F)(F)F)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.