methyl 2-amino-4-(1-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-4,6-dimethyl-9-oxo-4,9-dihydro-1H-imidazo[1,2-a]purin-7-yl)butanoate,methyl 2-amino-4-(1-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-4,6-dimethyl-9-oxo-4,9-dihydro-1H-imidazo[1,2-a]purin-7-yl)butanoate,Uridine