This chemical is called C.I. Acid Orange 156, and its systematic name is Benzenesulfonic acid, 4-(2-(5-methoxy-4-(2-(4-methoxyphenyl)diazenyl)-2-methylphenyl)diazenyl)-, sodium salt (1:1). With the molecular formula of C₂₁H₂₀N₄O₅S.Na, its molecular weight is 463.45. The CAS registry number of this chemical is 68555-86-2. Additionally, its product categories are Dyes and Pigments; Organics.

Other characteristics of the C.I. Acid Orange 156 can be summarised as followings: (1)H-Bond Donor: 0; (2)H-Bond Acceptor: 9; (3)Rotatable Bond Count: 7; (4)Exact Mass: 462.097385; (5)MonoIsotopic Mass: 462.097385; (6)Topological Polar Surface Area: 134; (7)Heavy Atom Count: 32; (8)Formal Charge: 0; (9)Complexity: 716; (10)Isotope Atom Count: 0; (11)Covalently-Bonded Unit Count: 2.

Preparation and uses of this chemical: The C.I. Acid Orange 156 could be obtained by the materials of sulfanilic acid, 3-amino-4-methoxy toluene, phenol. It's used for the Nylon, silk, wool and fabric dyeing.

You can still convert the following datas into molecular structure: 
1.InChI: InChI=1/C21H20N4O5S.Na/c1-14-12-20(25-23-15-4-8-17(29-2)9-5-15)21(30-3)13-19(14)24-22-16-6-10-18(11-7-16)31(26,27)28;/h4-13H,1-3H3,(H,26,27,28);/q;+1/p-1/b24-22-,25-23-;
2.Smiles: c1(c(cc(\N=N/c2ccc(S(=O)(=O)[O-])cc2)c(c1)C)OC)\N=N/c1ccc(OC)cc1.[Na+]