Guanosine-5′-diphosphate disodium salt, also known as GDP-Na2, is a nucleoside diphosphate comprised of guanosine linked to two phosphate groups and stabilized by two sodium ions. It plays a crucial role in various cellular processes, including signal transduction, energy metabolism, and protein synthesis. In research and pharmaceutical applications, GDP-Na2 is utilized as a substrate, cofactor, or regulatory molecule, aiding in the study of cellular functions and drug development.