cis-Perhydro-1,3-dimethyl-4,5-(epoxyethanoxy)purine-2,6,8-trione

The title compound, C₉H₁₂N₄O₅, adopts a distinct ring-twisted conformation defined by nearly orthogonal bridgehead torsion angles [C16-C15-C14-N19 of -90.1 (2) and C26-C25-C24-N29 of -87.8 (2)°]. The antiperiplanar array [C17-O14-C14-N19 of -158.0 (2) and C27-O24-C24-N29 of -158.3 (2)°] does not allow stereoelectronically controlled ring-opening at the C4-N9 bond.