146-80-5 1H-Purine-2,6-dione, 3,9-dihydro-9-beta-D-ribofuranosyl- 9-beta-D-Ribofuranosylxanthine AI3-52693 EINECS 205-679-9 NSC 18930 Xanthine riboside Xanthosine beta-D-Ribofuranoside, xanthine-9