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**Molecular formula:** C₄H₅N₃O
**Molar mass:** 111,10 g/mol
**Information:** Cytosine is a heterocyclic compound composed with nitrogen, together with thymine and uracil they are part of pyrimidine nucleobases. It is complementary to guanine (in both DNA and RNA), with which it binds through three hydrogen bonds.
**Use:** Nucleobases deliver nucleic acids the ability to store and transmit genetic information.
**Appearance:** It is the basis of nucleic acids (DNA and RNA).
