The C.I. Acid Red 4, with cas registry number of 5858-39-9, is also known as (1)Acid Eosine G; (2)Airedale Azo Eosine; (3)Amacid Eosine; (4)Atul Acid Fast Pink B; (5)Atul Acid Scarlet B; (6)Azo Eosine; (7)Azo Eosine G; (8)Azoeosin; (9)Bucacid Azo Eosine G; (10)C.I. 14710; (11)C.I. Acid Red 4, monosodium salt; (12)Calcocid Eosine G; (13)Curol Red B; (14)Erio Fast Scarlet B; (15)Fast Acid Red E; (16)Fenazo Red E; (17)Kiton Eosine GC; (18)Metamine Fast Acid Red N. It is a kind of organics. Its EINECS registry number is 227-490-0. Its systematic name is called sodium 4-hydroxy-3-(2-methoxyphenyl)azo-naphthalene-1-sulfonate. And its IUPAC name is called 3-[(2-methoxyphenyl)hydrazinylidene]-4-oxonaphthalene-1-sulfonic acid; sodium.

Physical properties about this chemical are: (1)log P (octanol-water): 0.640; (2)Water Solubility: 1610 mg/L 25°C; (3)Vapor Pressure: 2.87E-20 mm Hg 25°C; (4)Atmospheric OH Rate Constant: 1.32E-11 cm³/molecule-sec 25°C; (5)#H bond acceptors: 7; (6)#H bond donors: 2; (7)#Freely Rotating Bonds: 5; (8)Polar Surface Area: 119.76 Å².

You can still convert the following datas into molecular structure:
(1)InChI: InChI=1/C17H14N2O5S.Na/c1-24-15-9-5-4-8-13(15)18-19-14-10-16(25(21,22)23)11-6-2-3-7-12(11)17(14)20;/h2-10,20H,1H3,(H,21,22,23);/q;+1/p-1/b19-18-;
(2)Smiles: c12c(c(c(\N=N/c3c(cccc3)OC)cc1S(=O)(=O)[O-])O)cccc2.[Na+]