This chemical is called Mordant Brown 18, and its IUPAC name is disodium (5Z)-5-[(4-nitrophenyl)hydrazinylidene]-6-oxo-3-[(4-sulfonatophenyl)diazenyl]cyclohexa-1,3-diene-1-carboxylate. With the molecular formula of C₁₉H₁₃N₅O₈S.2Na, its molecular weight is 515.36. The CAS registry number of this chemical is 5850-12-4. In addiion, this chemical is purple-brown powder, and it is soluble in water and ethanol.

Other characteristics of the Mordant Brown 18 can be summarised as followings: (1)ACD/LogP: 3.02; (2)# of Rule of 5 Violations: 1; (3)ACD/LogD (pH 5.5): -2; (4)ACD/LogD (pH 7.4): -2; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 1; (8)ACD/KOC (pH 7.4): 1; (9)#H bond acceptors: 13; (10)#H bond donors: 3; (11)#Freely Rotating Bonds: 7; (12)Polar Surface Area: 203.26 Å².

You can still convert the following datas into molecular structure: 
1.SMILES: [Na+].[Na+].O=C3C(=CC(/N=N/c1ccc(cc1)S([O-])(=O)=O)=C\C3=N\Nc2ccc([N+]([O-])=O)cc2)\C([O-])=O
2.InChI: InChI=1/C19H13N5O8S.2Na/c25-18-16(19(26)27)9-13(22-20-12-3-7-15(8-4-12)33(30,31)32)10-17(18)23-21-11-1-5-14(6-2-11)24(28)29;;/h1-10,21H,(H,26,27)(H,30,31,32);;/q;2*+1/p-2/b22-20+,23-17-;; 
3.InChIKey: LOAQEDLDOVTLAI-MVCWODICBR