Tuberculinic acid, also known as picolinic acid, is an organic compound that is derived from the amino acid tryptophan. This acid is produced by Mycobacterium tuberculosis, the bacterium responsible for tuberculosis. Tuberculinic acid plays a crucial role in the immune response, as it acts as a chelating agent, binding to metal ions and enhancing the body's ability to fight off infections. Synonyms for tuberculinic acid include picolinate, tuberculosic acid, and 3-pyridinecarboxylic acid. These alternative names are often used interchangeably in scientific literature and research studies, highlighting the importance of this compound in understanding and combating the tuberculosis disease.