2-[O2,O3-isopropylidene-O5-(4-nitro-benzoyl)-α-D-ribofuranosyl]-3-oxo-pentanedioic acid diethyl ester

ethyl 4-hydroxy-3-(2',3'-O-isopropylidene-5'-O-trityl-β-D-ribofuranosyl)pyrazole-5-carboxylate

methyl 2-diazo-4-(2,3-O-isopropylidene-5-O-trityl-α-D-ribofuranosyl)-3-oxobutanoate

3(5)-cyano-4-hydroxy-5(3)-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)pyrazole

(2R,3R,4S,5S)-2-(acetoxymethyl)-5-(4-amino-5-cyano-1H-pyrazol-3-yl)tetrahydrofuran-3,4-diyl diacetate