.beta.-D-Ribofuranoside, 5-nitro-2-pyridinyl
P(1),P(2)-bis(6-mercaptopurine-9 beta-ribofuranoside)-5-pyrophosphate
.alpha.-D-Ribofuranoside, methyl 2,3,5-tris-O-(trimethylsilyl)-
4-aminopyrazolopyrimidine-2-deoxyribofuranoside
