Inosine-5'-diphosphoric acid disodium salt (IDP disodium salt, CAS 54735-61-4) is a nucleotide derivative consisting of the nucleoside inosine linked to a diphosphate group. It is a key intermediate in purine metabolism and nucleotide biosynthesis pathways. As a sodium salt, it offers improved solubility and stability in aqueous solutions compared to the free acid form. This compound serves as a crucial substrate and cofactor in various biochemical and enzymatic studies. It is widely used in life science research to investigate the mechanisms of enzymes such as kinases, phosphorylases, and ATP-dependent systems. IDP is involved in energy transfer processes and acts as a precursor for the synthesis of inosine triphosphate (ITP) and other nucleotide analogs. It is also employed in the study of G-protein coupled receptor signaling and as a component in cell culture media and diagnostic reagent formulations. Beyond basic research, IDP disodium salt finds application in the development of pharmaceutical intermediates and as a reference standard in analytical chemistry for nucleotide quantification. Its role in cellular energy metabolism makes it a compound of interest in studies related to ischemia, cardiovascular function, and metabolic disorders.