pyrimidine


pyrimidine

Any of a class of heterocyclic compounds with a ring structure of four carbon and two nitrogen atoms. The simplest member, pyrimidine itself (CHN), is not common, but derivatives with the structure are. Examples include thiamine (vitamin B), several sulfa drugs, barbiturates, and three of the bases in nucleic acids (cytosine, thymine, and uracil).

This entry comes from Encyclopædia Britannica Concise.
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