68797-11-5 8-Amino-3-D-ribofuranosyl-1,2,4-triazolo(4,3-a)pyrazine 8-Artp D-Ribitol, 1-C-(8-amino-1,2,4-triazolo(4,3-a)pyrazin-3-yl)-1,4-anhydro-, (S)-