2'-Deoxy-6-thio Guanosine

2',3'-Di-O-acetyl-5'-deoxy-5-fluoro-N4-(pentoxycarbonxyl)cytidine

3',5'-Di-O-acetyl-2'-deoxyuridine

5,6-Dichloropurine-1-b-D-ribofuanosyl-H-benzimidazole

2,6-Dichloro-9-(2',3',5'-tri-O-acetyl-b-D-ribofuranosyl)purine

2',2'-Difluoro-2'-deoxyuridine

2',2'-Difluoro-2'-deoxyuridine 3',5'-Dibenzoate

(R)-N-(2,3-Dihydro-1H-indenyl)adenosine

2-(Dimethylamino)guanosine

5'-Ethylcarboxamido Adenosine