4,4'-bis-hydrazino-stilbene-2,2'-disulphonic acid, 4,4'-DIHYDRAZINOSTILBENE-2-2'-DISULFONIC ACID, 4,4'-Dihydrazino-2,2'-stilbenedisulfonic acid, 4,4-DIHYDRAZINESTILBENE-2,2-DISULFONIC ACID, 5-hydrazinyl-2-[2-(4-hydrazinyl-2-sulfophenyl)ethenyl]benzenesulfonic acid, 4,4'-Dihydrazino-stilben-2,2'-disulfonsaeure