Pyrimidine is a type of organic compound that belongs to the class of heterocyclic aromatic compounds. It consists of a six-membered ring containing two nitrogen atoms at positions 1 and 3. Pyrimidine serves as a fundamental building block for several important biological molecules, including nucleotides, which are the building blocks of DNA and RNA. In addition to its role in genetics, pyrimidine derivatives are also significant in pharmaceuticals and biochemistry. Compounds like cytosine, thymine, and uracil are pyrimidine bases found in nucleic acids. These bases play crucial roles in encoding genetic information and regulating various cellular processes.