Adenine hemisulfate (6-Aminopurine hemisulfate) is 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.