for the following products
(2R,3R,3aS,9aR)-3-Hydroxy-2-(hydroxymethyl)-7-methyl-3,3a-dihydro-2H-furo[2',3':4,5]oxazolo[3,2-a]pyrimidin-6(9aH)-one | 2,2'-Anhydro-D-thymidine | 2，2-anhydro-5-methyluridine | 6H-Furo[2',3':4,5]oxazolo[3,2-a]pyrimidin-6-one,2,3,3a,9a-tetrahydro-3-hydroxy-2-(hydroxymethyl)-7-methyl-(2R,3R,3aS,9aR)- and 2,2'-Anhydro-5-methyluridine
