The title compound, C12H18N4O6, exhibits a hydrogen-bonding network, which contains inter-molecular classical N - H⋯O=C(imidazolone rings) hydrogen bonds and, in addition, inter-molecular C - H⋯O inter-actions that stabilize the crystal structure. Two ethyl groups are each disordered over two positions, with site occupancy factors in a ratio of ca 3:2....
