conformational properties were quantitatively evaluated for most of the bonds ( c4'-c5 ' , c5'-o5 ' , c2'-o2 ' , and c3'-o3 ' ) in the branched `` '' trinucleotides '' '' auu and agg by analysis of 1h-1h , 1h-31p , and 13c-31p coupling constants .
C0030054
o2
C0030106
o3