Adenosine, >98%, is a purine nucleoside composed of a molecule of adenine attached to a ribose sugar molecule. It is a major component of the energy transfer molecule ATP and is a biochemical regulator in several metabolic pathways. This product is of the highest quality, with a purity of >98%. It is ideal for use in biochemical and molecular biology research. It is supplied as a white crystalline powder and is stable in aqueous solutions.