2',3'-di-O-mesyl-5'-O-trityl-(1-β-D-lyxofuranosyl)uracil

2',3'-di-O-mesyl-5'-O-trityl-(1-β-D-xylofuranosyluracil)

β-D-xylouracil

β-D-lyxouracil

2',3'-O-(methoxymethylidene)uridine