The IUPAC name of this chemical is 2-hydroxy-5-nitrobenzaldehyde. With the CAS registry number 97-51-8, it is also named as 5-Nitrosalicylaldehyde; Benzaldehyde, 2-hydroxy-5-nitro-. The product's categories are fine chemical & intermediates; aromatic aldehydes & derivatives (substituted); benzaldehyde; aldehydes; carbonyl compounds. In addition, this chemical is yellow to brown crystals or powder which is sensitive to air and light.

The other characteristics of this product can be summarized as: (1)ACD/LogP: 2.08; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 1.52; (4)ACD/LogD (pH 7.4): -0.19; (5)ACD/BCF (pH 5.5): 6.12; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 88.2; (8)ACD/KOC (pH 7.4): 1.75; (9)#H bond acceptors: 5; (10)#H bond donors: 1; (11)#Freely Rotating Bonds: 3; (12)Index of Refraction: 1.666; (13)Molar Refractivity: 41.43 cm³; (14)Molar Volume: 111.3 cm³; (15)Polarizability: 16.42×10^-24 cm³; (16)Surface Tension: 70.5 dyne/cm; (17)Enthalpy of Vaporization: 56.19 kJ/mol; (18)Vapour Pressure: 0.000637 mmHg at 25°C; (19)Rotatable Bond Count: 1; (20)Tautomer Count: 4; (21)Exact Mass: 167.021858; (22)MonoIsotopic Mass: 167.021858; (23)Topological Polar Surface Area: 83.1; (24)Heavy Atom Count: 12.

Preparation of 2-Hydroxy-5-nitrobenzaldehyde: It can be obtained by 1,3,5,7-tetraaza-adamantane and 4-nitro-phenol with the reagent 75percent polyphoshoric acid (PPA) at 100 °C. The reaction time is 2 hours and the yield is 69 %.

Uses of 2-Hydroxy-5-nitrobenzaldehyde: It is used as intermediates of medicine, spices, dyes and other organic synthesis. For example: It reacts with aniline to get 4-Nitro-2-(phenylimino-methyl)-phenol. This reaction needs reagent benzene and solvent ethanol at ambient temperature. The yield is 79 %.

When you are using this chemical, please be cautious about it as the following:
It is harmful if swallowed. And it is irritating to eyes, respiratory system and skin. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If you want to contact this product, you must wear suitable protective clothing and eye/face protection.

People can use the following data to convert to the molecule structure. 
1. SMILES: O=Cc1cc(ccc1O)[N+]([O-])=O;
2. InChI: InChI=1/C7H5NO4/c9-4-5-3-6(8(11)12)1-2-7(5)10/h1-4,10H.

The following are the toxicity data which has been tested.