Definition: A group of compounds which consist of a nucleotide molecule to which an additional nucleoside is attached through the phosphate molecule(s). The nucleotide can contain any number of phosphates.
diadenosine 5',5''''-P1,P6-hexaphosphate [ Ap6A,Ap(6)A,P1,P6-di(adenosine-5')hexaphosphate,diadenosine hexaphosphate ] inhibits the action of ribonuceotide reductase on ADP