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**Molecular formula:** C₅H₅N₅O
**Molar mass:** 151,13 g/mol
**Information:** Guanine is a heterocyclic nitrogen compound together with adenine among purine nucleobase. It is complementary to cytosine (in DNA and in RNA), with which it forms 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).
