IUPAC Name: 4-methylpyridine-3-carboxylic acid 
Empirical Formula: C₇H₇NO₂
Molecular Weight: 137.136g/mol
Structure of 3-Pyridinecarboxylicacid, 4-methyl- (CAS NO.3222-50-2):

Index of Refraction: 1.561
Molar Refractivity: 36.09 cm³
Molar Volume: 111.4 cm³
Polarizability: 14.31×10^-24cm³
Surface Tension: 53.3 dyne/cm
Density: 1.23 g/cm³
Flash Point: 137.7 °C
Enthalpy of Vaporization: 57.49 kJ/mol
Boiling Point: 304.1 °C at 760 mmHg
Vapour Pressure: 0.000392 mmHg at 25°C 
Product Categories: Nitrogen cyclic compounds;Acids and Derivatives;Heterocycles;Carboxylic Acids;Pyridines;Pyridines derivates;Heterocyclic Compounds;Carboxylic Acids 
Canonical SMILES: CC1=C(C=NC=C1)C(=O)O
InChI: InChI=1S/C7H7NO2/c1-5-2-3-8-4-6(5)7(9)10/h2-4H,1H3,(H,9,10)
InChIKey: ZKUZSTXNVMIDCY-UHFFFAOYSA-N

Hazard Codes: Xi
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36
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

  3-Pyridinecarboxylicacid, 4-methyl- , its cas register number is 3222-50-2. It also can be called 4-Methylnicotinic acid ; 4-Methyl-3-pyridinecarboxylic acid ; 4-Methylnicotinic acid hydrochloride ;4-Methylpyridine-3-Carboxylic Acid . 3-Pyridinecarboxylicacid, 4-methyl- (CAS NO.3222-50-2) is irritating to eyes, respiratory system and skin. So you should wear suitable protective clothing.