This chemical is called 2,7-Naphthalenedisulfonicacid, 5-amino-4-hydroxy-3-[2-(2-hydroxy-5-nitrophenyl)diazenyl]-, sodium salt(1:2), and its systematic name is disodium 5-amino-4-hydroxy-3-(2-hydroxy-5-nitro-phenyl)azo-naphthalene-2,7-disulfonate. With the molecular formula of C₁₆H₁₀N₄Na₂O₁₀S₂, its molecular weight is 528.38. The CAS registry number of this chemical is 3564-28-1. Additionally, it's soluble in water and the solution is pale purple.

Other characteristics of the 2,7-Naphthalenedisulfonicacid, 5-amino-4-hydroxy-3-[2-(2-hydroxy-5-nitrophenyl)diazenyl]-, sodium salt(1:2) can be summarised as followings: (1)#H bond acceptors: 14; (2)#H bond donors: 6; (3)#Freely Rotating Bonds: 8; (4)Polar Surface Area: 268.18 Å².

You can still convert the following datas into molecular structure: 
1.SMILES: [Na+].[Na+].Oc3ccc(cc3N=Nc2c(cc1cc(cc(N)c1c2O)S([O-])(=O)=O)S([O-])(=O)=O)[N+]([O-])=O
2.InChI: InChI=1/C16H12N4O10S2.2Na/c17-10-6-9(31(25,26)27)3-7-4-13(32(28,29)30)15(16(22)14(7)10)19-18-11-5-8(20(23)24)1-2-12(11)21;;/h1-6,21-22H,17H2,(H,25,26,27)(H,28,29,30);;/q;2*+1/p-2
3.InChIKey: ZJFCBBBAQGUBFR-NUQVWONBAE