6,2'-anhydro-6-oxy-1-arabinofuranosyluracil-phosphoryl-(3'-5')- 6,2'-anhydro-6-oxy-1-arabinofuranosyluracil
6,2'-anhydro-6-oxy-1-arabinofuranosyluracil-phosphoryl-(3'-5')- 6,2'-anhydro-6-oxy-1-arabinofuranosyluracil