Using CC(=O)c1ccccc1C(F)(F)F, CCOC(=O)C(F)(F)F to produce O=C(CC(=O)C(F)(F)F)c1ccccc1C(F)(F)F, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.