Adenosine-d-2 is the deuterated form of Adenosine. Adenosine (Adenine riboside) is a widely present endogenous secretion that functions through four G protein-coupled receptors (A1, A2A, A2B, and A3). Adenosine impacts almost every aspect of cell physiology, including neuronal activity, vascular function, platelet aggregation, and the regulation of blood cells.