title: 3α,6α-Bis(ethoxy-carbon-yl)glycoluril (diethyl 2,5-dioxoperhydro-imidazo[4,5-d]imidazole-3a,6a-dicarboxyl-ate).
abstract: The title compound, C(10)H(14)N(4)O(6), crystallizes with two independent mol-ecules in the asymmetric unit. An extensive network of N-H⋯O and C-H⋯O inter-molecular hydrogen bonds stabilizes the crystal packing. One ethyl group is disordered over two positions; the site occupancy factors are 0.68 and 0.32.
authors.forename: Yu-Zhou
authors.initials: YZ
authors.lastname: Wang
authors.forename: Zhi-Guo
authors.initials: ZG
authors.lastname: Wang
authors.forename: Lin
authors.initials: L
authors.lastname: Li