Pyrimidine, also known as 1,3-diazobenzene, is a heterocyclic compound with the chemical formula C4H4N2. Pyrimidine is formed by substituting 2 nitrogen atoms for 2 carbons in the meta-position of benzene. It is a diazine and retains its aromaticity. Derivatives of pyrimidine widely exist in organic macromolecular nucleic acids, and many drugs also contain pyrimidine rings. In nucleic acids, three nucleobases are pyrimidine derivatives: cytosine, thymine and uracil. There are a variety of pyrimidine-containing drugs on the market, most of which are kinase inhibitors.
Bridged ring compound refers to any two rings in the compound, which share two non-directly connected carbon atoms, and are classified into bicyclic hydrocarbons, tricyclic hydrocarbons, tetracyclic hydrocarbons, etc. Carbon atoms used in two or more rings are bridgehead carbon atoms, and the bond connecting the bridgehead carbon atoms is called a bridge. Bridged ring compounds are a class of organic compounds that are widely present in nature and usually have important physiological activities, such as the famous anticancer drug paclitaxel and antimalarial drug artemisinin.
bridged compounds,bridged bicyclic compounds
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