5'-end purine ribonucleoside 5'-diphosphate(3-) residue
5'-end purine ribonucleoside 5'-diphosphate(3-) residue
An organic anionic group obtained by deprotonation of the diphosphate OH groups of any 5'-end purine ribonucleoside 5'-diphosphate residue; major species at pH 7.3.