pyrimidine
Pyrimidine - definition from Biology-Online.org
[(Science: biochemistry) A family of 6-membered heterocyclic compounds occurring in nature in a wide variety of forms. They are planar and aromatic in character and include several nucleic acid constituents (cytosine, thymine, and uracil, the smaller nucleotide bases) and form the basic structure of the barbiturates. It is the parent compound of the pyrimidine bases of nucleic acid.
MediLexicon pyrimidine - Medical Dictionary Definition for Term 'pyrimidine'
[1. a heterocyclic substance, the formal parent of several “bases” present in nucleic acids (uracil, thymine, cytosine) as well as of the barbiturates.
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