7-Benzamido-4-hydroxy-3-((4-((4-sulphophenyl)azo)phenyl)azo)naphthalene-2-sulphonic acid, 7-benzoylamino-4-hydroxy-3-[4-(4-sulfo-phenylazo)-phenylazo]-naphthalene-2-sulfonic acid, 2-Naphthalenesulfonic acid,7-(benzoylamino)-4-hydroxy-3-((4-((4-sulfophenyl)azo)phenyl)azo), 7-Benzoylamino-4-hydroxy-3-[4-(4-sulfo-phenylazo)-phenylazo]-naphthalin-2-sulfonsaeure, C.I. Direct Red 81, 7-(Benzoylamino)-4-hydroxy-3-((4-((4-sulfophenyl)azo)phenyl)azo)-2-naphthalenesulfonic acid, 3-[4-(4-Sulfo-phenylazo)-phenylazo]-7-benzamino-4-hydroxy-naphthalin-sulfonsaeure-(2), (Benzol-sulfonsaeure-(1))-(4 azo 1)-benzol-(4 azo 2)-(6-benzamino-naphthol-(1)-sulfonsaeure-(3)), EINECS 246-727-9, direct red 81, 4'-(6-Benzamino-1-hydroxy-3-sulfo-naphthyl-(2)-azo)-azobenzol-sulfonsaeure-(4), 7-benzamido-4-hydroxy-3-({4-[(4-sulfophenyl)azo]phenyl}azo)naphthalene-2-sulfonic acid