; C.I. Direct Black 80; trisodium 5-amino-8-[(E)-{4-[(2Z)-2-{7-[(2Z)-2-(7-amino-1-oxo-3-sulfonatonaphthalen-2(1H)-ylidene)hydrazinyl]-1-oxo-3-sulfonatonaphthalen-2(1H)-ylidene}hydrazinyl]phenyl}diazenyl]naphthalene-2-sulfonate; trisodium 6-amino-3-[(Z)-{7-[(E)-{4-[(Z)-(4-amino-7-sulfonatonaphthalen-1-yl)diazenyl]phenyl}diazenyl]-8-hydroxy-6-sulfonatonaphthalen-2-yl}diazenyl]-4-hydroxynaphthalene-2-sulfonate