Isonicotinic Acid

• CAT Number: R050663
• CAS Number: 55-22-1
• Molecular Formula: C₆H₅NO₂
• Molecular Weight: 123.11
• Purity: ≥95%
• Synonyms: 4-Pyridinecarboxylic Acid; 4-Carboxypyridine; 4-Picolinic Acid; 4-Pyridylcarboxylic Acid; NSC 1483; p-Pyridinecarboxylic Acid; γ-Picolinic Acid; γ-Pyridinecarboxylic Acid
• Target: Drug Metabolite
• Storage: -20°C
• IUPAC Name: pyridine-4-carboxylic acid
• InChI: InChI=1S/C6H5NO2/c8-6(9)5-1-3-7-4-2-5/h1-4H,(H,8,9)
• InChIKey: TWBYWOBDOCUKOW-UHFFFAOYSA-
• SMILES: C1=CN=CC=C1C(=O)O

Isonicotinic acid (Cat No.: R050663), also known as 4-pyridinecarboxylic acid, is an organic compound with the molecular formula C₆H₅NO₂. It consists of a pyridine ring substituted with a carboxylic acid group at the para (4-) position. This compound is a structural isomer of nicotinic acid and serves as a key intermediate in pharmaceutical synthesis, including the production of isoniazid, a first-line anti-tuberculosis drug. Isonicotinic acid exhibits mild acidity and participates in coordination chemistry, making it valuable in drug design and materials science.