(alphaS)-alpha-[(methoxycarbonyl)amino]-4,6-dimethyl-9-oxo-3-beta-D-ribofuranosyl-4,9-dihydro-3H-imidazo[1,2-alpha]purine-7-butanoic acid methyl ester

(alphaS)-alpha-[(methoxycarbonyl)amino]-4,6-dimethyl-9-oxo-3-beta-D-ribofuranosyl-4,9-dihydro-3H-imidazo[1,2-alpha]purine-7-butanoic acid methyl ester