Guanosine 5-diphosphate-15N5 (GDP-15N5) dilithium is 15N labeled Guanosine 5-diphosphate (HY-113066). Guanosine 5-diphosphate (GDP) is a nucleoside diphosphate that activates adenosine 5-triphosphate-sensitive K+ channel. Guanosine 5-diphosphate is a potential iron mobilizer, which prevents the hepcidin-ferroportin interaction and modulates the interleukin-6 (IL-6)/stat-3 pathway. Guanosine 5-diphosphate can be used in the research of inflammation, such as anemia of inflammation (AI)[1][2][3].