pyrimidine

A single-ringed, crystalline organic base, C₄H₄N₂, that forms uracil, cytosine, or thymine and is the parent compound of many drugs, including the barbiturates.

Any of several organic compounds derived from or structurally related to pyrimidine, especially the nitrogen bases uracil, cytosine, and thymine.

An organic compound, composed of carbon, hydrogen, and nitrogen, so arranged that the carbon and nitrogen atoms form a ring or chain, as shown in the formula .

A diazine in which the two nitrogen atoms are in the meta- positions; it is the basis of three of the bases found in DNA and RNA, thymine, uracil and cytosine

any of several basic compounds derived from pyrimidine

a heterocyclic organic compound with a penetrating odor