Synonyms : C.I. 23860;C.I. Direct Blue 53;C.I. direct blue 53 tetrasodium salt;C.I. Direct Blue 53, tetrasodium salt (8CI);Evans blue;Direct Blue 53;evans blue fluka;evans blue (C.I. 23860);tetrasodium 6,6-((3,3-dimethyl-(1,1-biphenyl-4,4diyl)bis(azo)bis(4-amino-5-hydroxy-1,3-naphthalenedisulphonate);blue Evan;Evens Blue;tetrasodium (6Z)-4-amino-6-({4'-[(2E)-2-(8-amino-1-oxo-5,7-disulfonatonaphthalen-2(1H)-ylidene)hydrazino]-3,3'-dimethylbiphenyl-4-yl}hydrazono)-5-oxo-5,6-dihydronaphthalene-1,3-disulfonate;tetrasodium 6,6'-[(3,3'-dimethylbiphenyl-4,4'-diyl)di(E)diazene-2,1-diyl]bis(4-amino-5-hydroxynaphthalene-1,3-disulfonate);tetrasodium (6E,6'E)-6,6'-[(3,3'-dimethylbiphenyl-4,4'-diyl)di(1E)hydrazin-2-yl-1-ylidene]bis(4-amino-5-oxo-5,6-dihydronaphthalene-1,3-disulfonate);