3-Methylpyridine-2-carboxylic acid, also known as nicotinic acid or pyridine-3-carboxylic acid, is an organic compound with the chemical formula C7H7NO2. It is a white crystalline solid that is soluble in water, ethanol, and ether. 3-Methylpyridine-2-carboxylic acid is a derivative of pyridine, a heterocyclic aromatic compound containing a nitrogen atom in a six-membered ring. 3-Methylpyridine-2-carboxylic acid is an important intermediate in the synthesis of various pharmaceuticals, agrochemicals, and other chemical products. It is also used as a building block in the preparation of vitamin B3 (niacin) and its derivatives, which play a crucial role in human metabolism and energy production. The compound can be synthesized through various methods, including the Kolbe-Schmitt reaction and the Chichibabin pyridine synthesis. Due to its versatile applications and importance in the chemical industry, 3-methylpyridine-2-carboxylic acid is a key compound in the development of new drugs and materials.