3',5'-di-O-benzoyl-2'-deoxyadenosine

2-bromo-6-amino-9-(2-deoxy-α-D-ribofuranosyl)purine

9-(5'-O-tert-butyldiphenylsilyl-2'-deoxy-α-D-erythro-pentofuranosyl)adenine

2,6-dibromo-9-(2-deoxy-3,5-di-p-toluyl-α-D-ribofuranosyl)purine

tris-O-(4-nitro-benzoyl)-α-D-erythro-2-deoxy-pentofuranose