| PubChem = 190 | SMILES = Nc1ncnc2[nH]cnc12 | MeSHName = }} | Section2 = | Section3 = }} Adenine's a nucleobase (a purine derivative) with a variety of roles in biochemistry including cellular respiration, in the form of both the energy-rich adenosine triphosphate (ATP) and the cofactors nicotinamide adenine dinucleotide (NAD) and flavin adenine dinucleotide (FAD), and protein synthesis, as a chemical component of DNA and RNA. The shape of adenine's complementary to either thymine in DNA or ur… (More on Adenine)