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**Molecular formula:** C₅H₅N₅ **Molar mass:** 135.13 g/mol **Description:** Adenine is a heterocyclic nitrogen compound that, along with guanine, is classified as a purine nucleobase. It pairs with thymine in DNA and with uracil in RNA, forming two hydrogen bonds. **Applications:** Nucleobases, such as adenine, enable nucleic acids to store and transmit genetic information. **Occurrence:** Adenine is a key component of essential molecules such as adenosine triphosphate (ATP), adenosine diphosphate (ADP), adenosine monophosphate (AMP), as well as nucleic acids (DNA and RNA).
