Using CCOC(=O)C(F)(F)F, CC(=O)c1nc2ccc(F)cc2s1 to produce O=C(CC(=O)C(F)(F)F)c1nc2ccc(F)cc2s1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.