Pyridine is a six-membered heterocyclic compound containing one nitrogen heteroatom. Pyridine and piperidine are the most frequently occurring heterocyclic building blocks in drug molecules. According to incomplete statistics, there are currently more than 180 drugs containing pyridine or piperidine structure that have been marketed, nearly 1/5 of the drugs approved for marketing in recent years contain these two structures.
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Pyridine is a basic heterocyclic organic compound with the chemical formula C5H5N. It is structurally related to benzene, with one methine group (=CH−) replaced by a nitrogen atom. It is a highly flammable, weakly alkaline, water-miscible liquid with a distinctive, unpleasant fish-like smell.
Naphthyridine is a class of aromatic heterocyclic compounds whose chemical formula is C8H6N2. They consist of naphthalene bicyclic rings in which two carbon atoms are replaced by nitrogen atoms. There are ten isomers of naphthyridine, because naphthyridine has two benzene rings, has strong π-π conjugation, and has better luminescence properties. Common naphthyridines are 1,8-naphthyridines. There are many kinds of 1,8-naphthyridine derivatives, and they are widely used.
Pliant announced positive safety and exploratory efficacy data from the INTEGRIS-PSC Phase 2a trial of Bexotegrast (PLN-74809) 320 mg in patients with primary sclerosing cholangitis and suspected liver ibrosis. PLN-74809 is an oral small-molecule dual-selective inhibitor of αvβ6 and αvβ1 integrins for the treatment of IPF and PSC. While present at very low levels in healthy tissues, these integrins are upregulated in the lungs of IPF patients and the bile ducts of PSC patients where they activate TGF-β, a key driver of the fibrotic process. Blocking these integrins is designed to stop TGF-β activation, potentially halting the growth of scar tissue.
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