2,2-Cyclouridine; 02,2-Cycloridine; 2,2-Anhydrocytidine; 2,2-Anhydro-1-(b-D-Arabinofuranosyl) Uracil; 2,2'-Anhydro-1-(β-D-arabinofuranosyl) uracil; 3-hydroxy-2-(hydroxymethyl)-2,3,3a,9a-tetrahydro-6H-furo[2',3':4,5][1,3]oxazolo[3,2-a]pyrimidin-6-one; (2R,3R,3aS,9aR)-3-hydroxy-2-(hydroxymethyl)-2,3,3a,9a-tetrahydro-6H-furo[2',3':4,5][1,3]oxazolo[3,2-a]pyrimidin-6-one; (2R,3R,3aR,9aR)-3-hydroxy-2-(hydroxymethyl)-2,3,3a,9a-tetrahydro-6H-furo[2',3':4,5][1,3]oxazolo[3,2-a]pyrimidin-6-one; 2,2'-Anhydro-uridine; Anhydro-U