The 2,7-Naphthalenedisulfonicacid, 3-[2-(2,4-dinitrophenyl)diazenyl]-4-hydroxy-, sodium salt (1:2), with the CAS registry number 5423-07-4 and EINECS registry number 226-549-8, has the systematic name of disodium 3-(2,4-dinitrophenyl)azo-4-hydroxy-naphthalene-2,7-disulfonate. It is a kind of bordeaux to brown powder, and should be stored at 2-8°C. The molecular formula of this chemical is C₁₆H₁₀N₄Na₂O₁₁S₂.

The physical properties of 2,7-Naphthalenedisulfonicacid, 3-[2-(2,4-dinitrophenyl)diazenyl]-4-hydroxy-, sodium salt (1:2) are as followings: (1)#H bond acceptors: 15; (2)#H bond donors: 3; (3)#Freely Rotating Bonds: 7; (4)Polar Surface Area: 267.75 Ų.

You should be cautious while dealing with this chemical. It may cause an explosion if heated. Therefore, you had better take the following instructions: Keep away from heat; Do not breathe dust; Avoid contact with skin and eyes.

You can still convert the following datas into molecular structure:
(1)SMILES: [Na+].[Na+].[O-][N+](=O)c3ccc(N=Nc2c(cc1cc(ccc1c2O)S([O-])(=O)=O)S([O-])(=O)=O)c(c3)[N+]([O-])=O
(2)InChI: InChI=1/C16H10N4O11S2.2Na/c21-16-11-3-2-10(32(26,27)28)5-8(11)6-14(33(29,30)31)15(16)18-17-12-4-1-9(19(22)23)7-13(12)20(24)25;;/h1-7,21H,(H,26,27,28)(H,29,30,31);;/q;2*+1/p-2
(3)InChIKey: XBLIFEQTVVSTIM-NUQVWONBAN