Using O=C(NS(=O)(=O)c1cccc([N+](=O)[O-])c1)C(F)(F)F to produce Nc1cccc(S(=O)(=O)NC(=O)C(F)(F)F)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.