Synonyms: EINECS 235-400-6;C.I. Direct Orange 72;AC1L4LZ6;1,3-Naphthalenedisulfonic acid, 7,7'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)-2,1-diazenediyl))bis-, sodium salt (1:4);1,3-Naphthalenedisulfonic acid, 7,7'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis-, tetrasodium salt;12217-64-0;7,7'-(Ureylenebis((5-methoxy-2-methyl-p-phenylene)azo))di-1,3-naphthalenedisulfonic acid, tetrasodium salt;Tetrasodium 7,7'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis(naphthalene-1,3-disulphonate);tetrasodium 7-[[4-[[4-[(6,8-disulfonatonaphthalen-2-yl)diazenyl]-2-methoxy-5-methylphenyl]carbamoylamino]-5-methoxy-2-methylphenyl]diazenyl]naphthalene-1,3-disulfonate