Also Called: Disodium;(8Z)-8-[[4-[4-[(4-ethoxyphenyl)diazenyl]phenyl]phenyl]hydrazinylidene]-7-oxonaphthalene-1,3-disulfonate;1,3-Naphthalenedisulfonic acid, 8-[[4'-[(4-ethoxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]-7-hydroxy-, disodium salt;Disodium 8-[[4'-[(4-ethoxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]-7-hydroxynaphthalene-1,3-disulphonate;1,3-Naphthalenedisulfonic acid, 8-[2-[4'-[2-(4-ethoxyphenyl)diazenyl][1,1'-biphenyl]-4-yl]diazenyl]-7-hydroxy-, sodium salt (1:2);1,3-Naphthalenedisulfonic acid, 8-[[4'-[(4-ethoxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]-7-hydroxy-;disodium salt;C.I. Direct Red 37, C.I.22240;Disodium,(8Z)-8-[[4-[4-[(4-ethoxyphenyl)diazenyl]phenyl]phenyl]hydrazinylidene]-7-oxonaphthalene-1,3-disulfonate;1,3-NAPHTHALENEDISULFONIC ACID, 8-[[4'-[(4-ETHOXYPHENYL)AZO] [1,1'-BIPHENYL]-4-YL]AZO]-7-HYDROXY-, DISODIUM SALT;C.I. 22240;C.I. DIRECT RED 37;C.I. direct red 037