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The title compound, C 12 H 20 N 4 O 5 , crystallizes in the monoclinic space group P 2 1 , with four crystallographically independent mol-ecules in the asymmetric unit. The four mol-ecules have a very similar conformation that is basically determined by the formation of two intra-molecular hydrogen bonds between the amino NH 2 donors and the carbonyl and ring O-atom acceptors, forming, respectively, R (6) and R (7) ring motifs.. In the crystal, inter-molecular hydrogen bonding leads to the formation of R  2  2 (10) ring patterns, involving one amide CONH 2 donor and an imidazole N-atom acceptor. The cluster of the four independent mol-ecules has approximate non-crystallographic C  2 point symmetry. The structural analysis also shows that during the synthesis of the title compound, the reductive cleavage of the d-ribose ring of the inosine precursor proceeds stereoselectively, with retention of configuration.

5-Amino-1-(2′,3′-O-isopropylidene-D-ribityl)-1H-imidazole-4-carboxamide: a crystal structure withZ′ = 4