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Cytosine (/ËsaÉªtÉËsiËn, -ËziËn, -ËsÉªn/;[2][3] C) is one of the four main bases found in DNA and RNA, along with adenine, guanine, and thymine (uracil in RNA). It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an amine group at position 4 and a keto group at position 2).
1. A single-ringed, crystalline organic base, C 4 H 4 N 2, that forms uracil, cytosine, or thymine and is the parent compound of many drugs, including the barbiturates. 2. Any of several organic compounds derived from or structurally related to pyrimidine, especially the nitrogen bases uracil, cytosine, and thymine.. a heterocyclic compound, C 4 H 4 N 2, that is the basis of several important biochemical substances. 2. one of several pyrimidine derivatives, esp. the bases cytosine, thymine, and uracil, which are fundamental constituents of nucleic acids.