Syonyms Name: C.I. Direct Blue 71; C.I. 34140; Direct Blue 71; direct blue 71 (C.I. 34140); tetrasodium 3-[(E)-{4-[(E)-{4-[2-(6-amino-1-oxo-3-sulfonatonaphthalen-2(1H)-ylidene)hydrazino]-6-sulfonatonaphthalen-1-yl}diazenyl]naphthalen-1-yl}diazenyl]naphthalene-1,5-disu