Pharmaceutical intermediates specializing in customization

On October 27, 017, the World Health Organization's International Agency for Research on Cancer (IARC) published a preliminary collation of the list of carcinogens for reference, and pyridine is in the list of carcinogens in category 2B. Pyridine The structure of pyridine-based pharmaceutical intermediates is very similar to benzene, and the carbon-carbon bond length in the pyridine molecule, measured by recent physical methods, is 139 pm, which is between the C-N single bond (147 pm) and the C=N double bond (128 pm), and its carbon-carbon and carbon-nitrogen bond lengths are also similar in numerical value, with a bond angle of about 120°, which suggests that the bond on the pyridine ring is more averaged, but not as complete as that of benzene.