Molecular structure of 2-Chloronicotinic acid (CAS NO.2942-59-8) is:

Product Name: 2-Chloronicotinic acid 
CAS Registry Number: 2942-59-8
IUPAC Name: 2-chloropyridine-3-carboxylic Acid 
Molecular Weight: 157.55446 [g/mol] 
Molecular Formula: C₆H₄ClNO₂ 
XLogP3-AA: 1.3 
H-Bond Donor: 1 
H-Bond Acceptor: 3 
EINECS: 220-937-0 
Melting Point: 176-178 °C (dec.)(lit.)
Index of Refraction: 1.59 
Molar Refractivity: 36.16 cm³ 
Molar Volume: 107.1 cm³ 
Surface Tension: 61 dyne/cm 
Density: 1.47 g/cm³ 
Flash Point: 145.4 °C 
Enthalpy of Vaporization: 58.93 kJ/mol 
Boiling Point: 316.8 °C at 760 mmHg 
Vapour Pressure: 0.000168 mmHg at 25 °C 
Product Categories: blocks;Carboxes;Pyridines;Pyridine;Acids and Derivatives;Heterocycles;Pyridines, Pyrimidines, Purines and Pteredines;Carboxylic Acids;Organic acids;Diflufenican;Chloropyridines;Halopyridines;Carboxylic Acids 
Canonical SMILES: C1=CC(=C(N=C1)Cl)C(=O)O
InChI: InChI=1S/C6H4ClNO2/c7-5-4(6(9)10)2-1-3-8-5/h1-3H,(H,9,10) 
InChIKey: IBRSSZOHCGUTHI-UHFFFAOYSA-N

 2-Chloronicotinic acid (CAS NO.2942-59-8) can be used as an intermediate for agrochemicals, feed additives, pharmaceuticals and animal food enrichments.

Safty information about 2-Chloronicotinic acid (CAS NO.2942-59-8) is: 
Hazard Codes: Xi 
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin. 
Safety Statements: 22-24/25-37/39-26-36 
S22:Do not breathe dust. 
S24/25:Avoid contact with skin and eyes. 
S37/39:Wear suitable gloves and eye/face protection. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing. 
WGK Germany: 3
Hazard Note: Irritant 
TSCA: T 
HazardClass: IRRITANT 
HS Code: 29333999

 2-Chloronicotinic acid , its cas register number is 2942-59-8. It also can be called 2-Chloro-3-pyridinecarboxylic acid ; Nicotinic acid, 2-chloro- ; 3-Pyridinecarboxylic acid, 2-chloro- .It is a white to cream powder.