Using NC(=O)c1ccccc1N, O=C([O-])C(F)(F)c1ncc(F)cn1 to produce NC(=O)c1ccccc1NC(=O)C(F)(F)c1ncc(F)cn1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.