Direct Blue 74; C. I. Direct Blue 74; 2-Naphthalenesulfonic acid, 5(or 8)-(2-(6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl)-8(or 5)-(2-(6(or 7)-sulfo-4-(2-(3-sulfophenyl)diazenyl)-1-naphthalenyl)diazenyl)-, sodium salt (1:4); 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-((6(or 7)-sulfo-4-((6(or 7)-sulfo-4-((3-sulfophenyl)azo)-1-naphthalenyl)azo)-1-naphthalenyl)azo)-, tetrasodium salt; Tetrasodium 7-amino-4-hydroxy-3-((6(or 7)-sulphonato-4-((6(or 7)-sulphonato-4-((3-sulphonatophenyl)azo)naphthyl)azo)naphthyl)azo)naphthalene-2-sulphonate
![7-氨基-4-羟基-3-[[6（或7）-磺酸基-4-[[6（或7）-磺酸基-4-[（3-磺酸基苯基）偶氮]萘基]偶氮]萘基]萘-2-磺酸四钠盐 33540-94-2](https://images-a.chemnet.com/suppliers/chembase/cas9/cas33540-94-2.gif)