Guanosine 5'-diphosphate disodium salt is a nucleotide derivative, specifically the disodium salt of guanosine diphosphate (GDP). It is a high-purity biochemical reagent, typically supplied as a white to off-white lyophilized powder. As a nucleotide, it serves as a fundamental building block in nucleic acid synthesis and is a key metabolite in cellular energy transfer and signal transduction pathways. Its primary applications are in life science research and pharmaceutical development. It is widely used as a substrate or cofactor in enzymatic assays, particularly those involving kinases, GTPases, and other nucleotide-binding proteins. In metabolic studies, it is crucial for investigating the citric acid cycle and purine metabolism. Furthermore, it serves as a critical raw material or intermediate in the synthesis of more complex nucleotides, nucleotide analogs, and potential therapeutic agents, such as certain antiviral or anticancer prodrugs that target nucleotide metabolism. This compound requires storage at -20°C or below to maintain stability. It is intended for research use only in laboratory settings. Handling should follow standard biosafety protocols for biochemical reagents.