Synonyms: Adenosine5'-(pentahydrogen tetraphosphate), 5'®5'-ester with adenosine (8CI); Adenosine5'-tetraphosphate, 5'-ester with adenosine (7CI); 5'-Adenylic acid, 5'®5'-anhydride with adenosine5'-triphosphate (8CI); 5',5'''-Diadenosine tetraphosphate;Adenosine-5'-tetraphospho-5'-adenosine; Ap4A; AppppA; Diadenosine5',5'''-P1,P4-tetraphosphate; Diadenosine tetraphosphate;P1,P4-Di(adenosin-5'-yl)tetraphosphate; P1,P4-Diadenosine-5'-tetraphosphate