β-D-ribofuranosyl-1-carboximidic acid methyl ester

methyl 2,5-anhydroallonothioate

ethyl 5-amino-2-(β-D-ribofuranosyl)thiazole-4-carboxylate

methyl 1'-(2',3',5'-tri-O-benzoyl-β-D-ribofuranosyl)thiazoline-4'-carboxylate

benzyl 3-methyl-2-[(1R,5R)-3-(2',3',5'-tri-O-benzoyl-β-D-ribofuranosyl)-7-oxo-4-thia-2,6-diazabicyclo[3.2.0]hept-2-en-6-yl]but-2-enoate