5-[2-(5-O-tert-butyldiphenylsilyl-2,3-O-isopropylidene-1-deoxy-β-D-ribofuranos-1-yl)ethyl]-[1,2,4]triazolo[1,5-a]pyrimidine

(E)-1-(5-amino-1H-1,2,4-triazol-1-yl)-5-(5-O-tert-butyldiphenylsilyl-2,3-O-isopropylidene-1-deoxy-β-D-ribofuranos-1-yl)pent-1-en-3-one