A purine nucleoside that has hypoxanthine linked by the N9 nitrogen to the C1 carbon of ribose. It is an intermediate in the degradation of purines and purine nucleosides to uric acid and in pathways of purine salvage. It also occurs in the anticodon of certain transfer RNA molecules. (Dorland, 28th ed) Present in meat extracts and sugar beet A purine nucleoside that has hypoxanthine linked by the N9 nitrogen to the C1 carbon of ribose.