first , in double label in vivo experiments with [ 2'-18o ] - and [ u-14c ] adenosine , the 18o:14c ratio of the ara-a isolated does not change appreciably , indicating a stereospecific inversion of the c-2 ' hydroxyl of adenosine to ara-a with retention of the 18o at c-2 ' .
C0001443
adenosine
C0042646
ara-a