(3S,2R)-3-Hydro­xy-2-hydroxy­methyl-7,9-di­aza­spiro­[4.5]­decane-6,8,10-trione

The trans stereochemical relationship of the two substituents of the title compound, C₉H₁₂N₂O₅, a new spiro-nucleoside, has been confirmed. The cyclo­pentane moiety adopts the C3′-endo-type conformation, while the barbiturate ring is almost planar. Molecules interconnected by a two-dimensional network of hydrogen bonds build layers parallel to the ab plane.