Noun
English Wikipedia has an article on:ADP-riboseWikipedia
ADP-ribose (uncountable)
(biochemistry) A phosphate ester of ribose and adenosine diphosphate
This ADP-ribosylation involves the transfer of an ADP-ribose from NAD+ to a diphthamide (a modified histidine ) residue within the EF-2 protein. Source: Internet