9-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-1H-purin-6(9H)-one-15N4;1,9-Dihydro-9-?-D-ribofuranosyl-6H-purin-6-one-15N4; 9-?-D-Ribofuranosylhypoxanthine-15N4; Hypoxanthine 9-?-D-ribofuranoside-15N4; Hypoxanthine Ribonucleoside-15N4; Hypoxanthine Riboside-15N4;Inosine-15N4