a number of 5'- ( o-acyl ) derivatives of 9-beta-d-arabinofuranosyladenine ( ara-a , vira-a ) ( 2a-k ) were prepared by direct acylation of the parent nucleoside 1 in pyridine-n , n-dimethyliformamide .
C0042646
ara-a
C0699565
vira-a