Quinolinic acid (QUIN) is an endogenous N-methyl-D-aspartate (NMDA) receptor agonist synthesized from L-tryptophan via the kynurenine pathway.

4-Pyridoxic Acid (4-Pyridoxinsaeure), a catabolite of vitamin B6, is a water-soluble B-group vitamin that can be used as a urinary diagnostic biomarker for determining the nutritional status of these vitamins.

PCL 016 (2-Picolinic acid) is a topical antiviral agent, which inhibits adenovirus replication in rabbit.

TRIA-662 (Nicotinamide Chloromethylate) is a niacin metabolite excreted via the urinary system.

6-Hydroxynicotinic acid (6-Hydroxypyridine-3-carboxylic acid) is exploited in the use of NMR spectroscopy or gas chromatography--mass spectrometry for the diagnosis of Pseudomonas aeruginosa in urinary tract infection. Among the common bacteria causing urinary infection, only P. aeruginosa produces 6-hydroxynicotinic acid from nicotinic acid.

The 4-carboxyaldehyde form of vitamin B6 which is converted to pyridoxal phosphate which is a coenzyme for synthesis of amino acids, neurotransmitters (serotonin, norepinephrine), sphingolipids, aminolevulinic acid.

Pyridoxal (Pyridoxaldehyde), a component of vitamin B6, is an aldehyde obtained by oxidizing pyridoxine and is widely found in plants and animals.

N-Methylnicotinamide is one of the endogenous metabolites that ameliorates endothelial dysfunction.

Pyridoxylamine dihydrochloride (Pyridorin) is a hydrochloride salt of one form of vitamin B6.

α-Pyridone (2-Hydroxypyridine)e is the catalyst for generating β-oxopropyl carbonates from cyclic carbonates and alcohols and in the aminolysis of a polyglutamate.

1-Methyl-4-pyridone-3-carboximide is an organic compound with utility in life science research, and 1-Methyl-4-pyridone-3-carboximide serves as a useful intermediate and model structure in biochemical and pharmacological studies, contributing to investigations of nicotinamide-related pathways and expanding its relevance as a versatile chemical probe in metabolic and biomedical research applications.

FAPy-adenine HCl is a metabolic marker for Attention Deficit Hyperactivity Syndrome and is a mutagenic product of ROS-induced DNA damage.

Isonicoteine is a structural isomer of pyridine alkaloids and nicotine, widely used in biochemical experiments and drug synthesis research.

2,3-Lutidine (2,3-Dimethylpyridine) is a pyridine derivative widely used in biochemical experiments and drug synthesis research.

Quipazine is a non-selective 5-HT receptor agonist. It stimulates central serotonin receptors to induce serotonin syndrome in animal models, utilized for studying behavioral regulation and sleep cycle control.

Piericidin A is a natural mitochondrial NADH- ubiquinone oxidoreductase (complex I) inhibitor. Piericidin A interferes with the electron transfer chain by inhibiting the activity of NADH- ubiquinone reductase, thus inhibiting mitochondrial respiration, which shows a certain neurotoxic effect. Piericidin A has potential quorum sensing inhibitory activity, antibacterial, antitumor and insecticidal activities.

2-O-Methylcytosine is an O-alkylated DNA adduct and is recognized as a damaged nucleobase. As an analogue of cytosine, it acts as a human endogenous metabolite. The presence of 2-O-Methylcytosine can alter the structural stability and base-pairing properties of DNA. The accumulation of such damaged nucleobases is closely linked to the induction of DNA mutations, which may result in various diseases, including cancer.

2-Ethyl-5-methylpyrazine is a pyrazine compound suitable for biochemical experiments and drug synthesis research.

3-Ethyl-2,5-dimethylpyrazine is a pyrazine compound suitable for biochemical experiments and drug synthesis research.

Bacimethrin (NSC 66577) is a natural product isolated from certain bacteria, acting as an inhibitor of bacterial and yeast growth and an antagonist in thiamine biosynthesis.

4-Butylpyridine is a heterocyclic organic chemical compound, 4-Butylpyridine is utilized as a additive in dye-sensitized solar cells (DSSCs). 4-Butylpyridine is a constituent of hole transport materials in perovskite and polymer solar cells, where its primary function is to improve photovoltaic efficiency by effectively reducing undesirable charge recombination processes, 4-Butylpyridine is also identified as a naturally occurring substance in plants such as Mentha arvensis.

Pyridoxal phosphate (Standard) is the analytical standard of Pyridoxal phosphate, primarily used for research and analytical applications. Pyridoxal phosphate (PLP) is the active form of Vitamin B6 and acts as an essential cofactor for over 140 enzymatic reactions, including transamination, decarboxylation, and racemization. Additionally, it has been shown to inhibit the activity of reverse transcriptases and is utilized in studies concerning tardive dyskinesia.