Using O=[N+]([O-])O, NS(=O)(=O)c1c(Cl)cccc1Cl to produce NS(=O)(=O)c1c(Cl)ccc([N+](=O)[O-])c1Cl, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.