Reported in EPA TSCA Inventory. EPA Genetic Toxicology Program.

The Pigment orange, with the CAS registry number 3468-63-1 and EINECS registry number 222-429-4, has the systematic name of 1-[(E)-(2,4-dinitrophenyl)diazenyl]naphthalen-2-ol. It is a kind of orange powder, and belongs to the following product categories of Dyes & Pigments and Organics. And the molecular formula of the chemical is C₁₆H₁₀N₄O₅.

The physical properties of Pigment orange are as followings: (1)ACD/LogP: 5.09; (2)# of Rule of 5 Violations: 1; (3)ACD/LogD (pH 5.5): 5.09; (4)ACD/LogD (pH 7.4): 5.09; (5)ACD/BCF (pH 5.5): 4382.86; (6)ACD/BCF (pH 7.4): 4382.86; (7)ACD/KOC (pH 5.5): 14072.25; (8)ACD/KOC (pH 7.4): 14072.24; (9)#H bond acceptors: 9; (10)#H bond donors: 1; (11)#Freely Rotating Bonds: 5; (12)Polar Surface Area: 136.59 Å²; (13)Index of Refraction: 1.711; (14)Molar Refractivity: 86.91 cm³; (15)Molar Volume: 222 cm³; (16)Polarizability: 34.45×10^-24cm³; (17)Surface Tension: 70.7 dyne/cm; (18)Density: 1.52 g/cm³; (19)Flash Point: 315.4 °C; (20)Enthalpy of Vaporization: 92.33 kJ/mol; (21)Boiling Point: 597.9 °C at 760 mmHg; (22)Vapour Pressure: 6.82E-15 mmHg at 25°C.

Preparation and uses of Pigment orange: Diazotize 2,4-dinitro-naphthylamine with Sulfuric acid and sodium sulfite, and then react with 2-isonaphthol, after a series of filtration, drying, grinding, you can get the product. And it is usually used in paint, ink, watercolor and so on.

You should be cautious while dealing with this chemical. It is a kind of flammable chemical. Therefore, you had better keep it away from sources of ignition, and do not smoke.

You can still convert the following datas into molecular structure:
(1)SMILES: O=N(=O)c3ccc(/N=N/c1c2ccccc2ccc1O)c(c3)N(=O)=O
(2)InChI: InChI=1/C16H10N4O5/c21-15-8-5-10-3-1-2-4-12(10)16(15)18-17-13-7-6-11(19(22)23)9-14(13)20(24)25/h1-9,21H/b18-17+
(3)InChIKey: HBHZKFOUIUMKHV-ISLYRVAYBU