Using [OH-], Nc1nc(N)c2cc(Sc3ccc(Cl)c(Cl)c3)ccc2n1 to produce Nc1nc(N)c2cc(S(=O)c3ccc(Cl)c(Cl)c3)ccc2n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.