27816-59-7 4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic acid 4-Acetamido-4'-isothiocyanostilbene-2,2'-disulfonic acid 51023-76-8 Benzenesulfonic acid, 5-(acetylamino)-2-(2-(4-isothiocyanato-2-sulfophenyl)ethenyl)- NSC 328387 SITS