for the following products
5-Amino-1-((3aR,4R,6R,6aR)-6-(hydroxymethyl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)-1H-imidazole-4-carboxamide | 5-Amino-1-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-1H-imidazole-4-carboxamide and 5-Amino-1-(2,3-O-isopropylidene-beta-D-ribofuranosyl)-1H-imidazole-4-carboxamide
