118121-38-3 4-Acetamido-4'-maleimidylstilbene-2,2'-disulfonic acid Amids-stilbene Benzenesulfonic acid, 5-(acetylamino)-2-(2-(4-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)-2-sulfophenyl)ethenyl)-