Using O=CN1CCOC(S(=O)(=O)c2cc([N+](=O)[O-])cc(C(F)(F)F)c2)C1 to produce Nc1cc(C(F)(F)F)cc(S(=O)(=O)C2CN(C=O)CCO2)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.