Tags: Chemical Compound, Chemical Substance.
Pyrimidine is an aromatic heterocyclic organic compound similar to pyridine. One of the three diazines (six-membered heterocyclics with two nitrogen atoms in the ring) it has the nitrogens at positions 1 and 3 in the ring. The other diazines are pyrazine (nitrogens 1 and 4) and pyridazine (nitrogens 1 and 2). In nucleic acids three types of nucleobases are pyrimidine derivatives: cytosine (C) thymine (T) and uracil (U).
