Reported in EPA TSCA Inventory.

The 4-Nitrosalicylic acid, with the CAS registry number 619-19-2, is also known as 4-Nitro-2-hydroxybenzoic acid. It belongs to the product categories of Aromatic Carboxylic Acids, Amides, Anilides, Anhydrides & Salts; C7; Carbonyl Compounds; Carboxylic Acids. Its EINECS number is 210-584-0. This chemical's molecular formula is C₇H₅NO₅ and molecular weight is 183.12. What's more, its systematic name is 2-Hydroxy-4-nitrobenzoic acid. 

Physical properties of 4-Nitrosalicylic acid are: (1)ACD/LogP: 2.859; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -0.27; (4)ACD/LogD (pH 7.4): -0.29; (5)ACD/BCF (pH 5.5): 1.00; (6)ACD/BCF (pH 7.4): 1.00; (7)ACD/KOC (pH 5.5): 1.00; (8)ACD/KOC (pH 7.4): 1.00; (9)#H bond acceptors: 6; (10)#H bond donors: 2; (11)#Freely Rotating Bonds: 3; (12)Polar Surface Area: 103.35 Å²; (13)Index of Refraction: 1.664; (14)Molar Refractivity: 41.61 cm³; (15)Molar Volume: 112.234 cm³; (16)Polarizability: 16.495×10^-24cm³; (17)Surface Tension: 84.1 dyne/cm; (18)Density: 1.632 g/cm³; (19)Flash Point: 179.176 °C; (20)Enthalpy of Vaporization: 67.326 kJ/mol; (21)Boiling Point: 389.046 °C at 760 mmHg; (22)Vapour Pressure: 0 mmHg at 25°C.

Uses of 4-Nitrosalicylic acid: it can be used to produce 2-methoxy-4-nitro-benzoic acid methyl ester at the temperature of 20 °C. It will need solvent diethyl ether with the reaction time of 4 hours. The yield is about 96%.

When you are using this chemical, please be cautious about it as the following:
This chemical is irritating to eyes, respiratory system and skin. It is harmful if swallowed. In case of contact with eyes, you should rinse immediately with plenty of water and seek medical advice. When using it, you need wear suitable protective clothing.

You can still convert the following datas into molecular structure:
(1)SMILES: O=C(O)c1ccc(cc1O)[N+]([O-])=O
(2)Std. InChI: InChI=1S/C7H5NO5/c9-6-3-4(8(12)13)1-2-5(6)7(10)11/h1-3,9H,(H,10,11)
(3)Std. InChIKey: UKWUOTZGXIZAJC-UHFFFAOYSA-N

The toxicity data is as follows: