The Acid Red 151, with the CAS registry number 6406-56-0, is also known as Sodium 4-(4-(2-hydroxynaphthalenylazo)phenylazo)benzenesulphonate. It belongs to the product categories of Dyes and Pigments; Organics. Its EINECS number is 229-029-9. This chemical's molecular formula is C₂₂H₁₅N₄O₄S^.Na and molecular weight is 454.43. What's more, its systematic name is Sodium 4-({4-[(2-hydroxy-1-naphthyl)diazenyl]phenyl}diazenyl)benzenesulfonate. This chemical is suitable for dyeing of nylon, silk, wool and wool fabric.

Physical properties of Acid Red 151 are: (1)#H bond acceptors: 8; (2)#H bond donors: 2; (3)#Freely Rotating Bonds: 6; (4)Polar Surface Area: 135.25 Å².

Preparation of m-Toluamide: this chemical can be prepared by 4-aminoazophenyl-4 '-sulfonic acid and 2-naphthol. First diazotize the former, and then couple with the latter, amd finally the product is got.

You can still convert the following datas into molecular structure:
(1)SMILES: [Na+].[O-]S(=O)(=O)c1ccc(cc1)N=Nc2ccc(cc2)N=Nc3c4ccccc4ccc3O
(2)Std. InChI: InChI=1S/C22H16N4O4S.Na/c27-21-14-5-15-3-1-2-4-20(15)22(21)26-25-17-8-6-16(7-9-17)23-24-18-10-12-19(13-11-18)31(28,29)30;/h1-14,27H,(H,28,29,30);/q;+1/p-1
(3)Std. InChIKey: QERXHBDEEFLTOL-UHFFFAOYSA-M

The toxicity data is as follows: