5'- Azido- 5'- deoxyguanosine ( 5'-N₃-Guo )
3'- Azido- 3'- deoxyguanosine ( 3'-N₃-Guo )
3'- Azido- 3'- deoxyadenosine ( 3'-N₃-Ado )
2, 6- Dichloro- 2', 3', 5'- triacetylpurine riboside
2', 3'- O- para- Anisylideneguanosine
2', 3', 5'- Tri- O- benzoylguanosine