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.
Pyrrolidine, also known as tetrahydropyrrole, is a saturated five-membered heterocyclic ring, which is miscible with water. Pyrrolidine exists in many alkaloids and drug molecules, such as kappa opioids, antagonists of dopamine D4 receptors, and HIV reverse transcriptase inhibitors.
The ADC linker is one of the three main components of antibody drug conjugates (ADCs), linking the antibody to the effective drug (payload) through chemical bonds. ADC linkers play a key role in determining the overall success of antibody drug conjugates. One of the major challenges in developing safe and effective ADC drugs is to assemble an ideal chemical linker between the cytotoxic payload and the mAb. Well-designed ADC linkers can help the selective delivery of antibodies at the tumor site and the accurate release of cytotoxic drugs.