2 deoxyribose 2 2,6 diaminopurine 2',3' dideoxyriboside 2 Azanucleosides 2 Coupled enzymatic systems 2 DNA synthesis 2 Glycosyltransfer reaction 2 Immobilisation 2 NP-I family 2 RNA directed DNA polymerase inhibitor 2 RNA synthesis 2 TP-catalysed phosphorolysis 2 abacavir 2 adenosine deaminase 2 amdoxovir 2 antiinfective agent 2 antineoplastic activity 2 antineoplastic agent 2 antiviral activity 2 azathioprine 2 benzimidazole derivative 2 binding affinity 2 catalysis 2 cladribine 2 cytarabine 2 didanosine 2 dihydropyrimidine dehydrogenase 2 drug screening 2 drug structure 2 drug synthesis 2 drug targeting 2