5'p-2',5',-A-Co-Co (Co = Cordycepin) AIDS-042765 AIDS042765 [5-(6-Aminopurin-9-yl)-4-({[5-(6-aminopurin-9-yl)-4-hydroxyoxolan-2-yl]methyl}oxyphosphinyl)oxolan-2-yl]methyl 2-(6-aminopurin-9-yl)-4-hydroxy-5-[(oxyphosphinyloxyphosphinyl)methyl]oxolan-3-yl hydrogen phosphate