Pyridine derivatives are chemical compounds that contain a pyridine ring, which is a six-membered aromatic ring with one nitrogen atom replacing a carbon atom. These derivatives are important in various fields, including pharmaceuticals, agrochemicals, and materials science, due to their diverse biological activities and chemical properties. Common pyridine derivatives include nicotine, used in tobacco products, and pyridoxine, also known as vitamin B6, essential for metabolism. The versatility of pyridine derivatives allows for modifications that enhance their effectiveness in applications such as drug development and synthesis of functional materials.