selected nucleoside 5'-triphosphates were converted to 2',5'-oligonucleotides with the following order of efficiency for the nucleoside : 8-azaadenosine greater than adenosine = 2-chloroadenosine greater than sangivamycin greater than toyocamycin greater than formycin greater than 3-ribosyladenine greater than ribavirin greater than tubercidin greater than adenosine 1-oxide greater than 2-beta-d-ribofuranosylthiazole-4-carboxamide greater than inosine = 1 , n6-ethenoadenosine greater than guanosine greater than 8-bromoadenosine = uridine greater than cytidine .
C0000275
2-chloroadenosine
C0001443
adenosine