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**Molecular formula:** C₄H₄N₂O₂
**Molar mass:** 112,09 g/mol
**Information:** Uracil is a heterocyclic nitrogen compound together with thymine and cytosine among pyrimidine nucleobases. It is complementary to adenine (in RNA) with which it forms two hydrogen bonds.
**Use:** Nucleobases deliver nucleic acids the ability to store and transmit genetic information.
**Appearance:** It is the basis of nucleic acids (RNA only).