title: 1,3,5,7,9,11,13,15-Octa-azapenta-cyclo-[9.5.1.1.0.0]octa-decane-4,8,12,16-tetrone monohydrate: a methyl-ene-bridged glycoluril dimer.
abstract: In the title compound, C(10)H(12)N(8)O(4)·H(2)O, prepared from the reaction of glycoluril with paraformaldehyde, the organic molecule has mm symmetry. The asymmetric unit comprises one quarter of the mol-ecule and a half-mol-ecule of water. The dimer is formed by bridging two glycoluril mol-ecules with methyl-ene groups at the 1 and 6 positions. In the crystal structure, mol-ecules are linked via N-H⋯O and O-H⋯O hydrogen bonds, forming a two-dimensional framework.
authors.forename: Pei-Hua
authors.initials: PH
authors.lastname: Ma
authors.forename: Xin
authors.initials: X
authors.lastname: Xiao
authors.forename: Yun-Qian
authors.initials: YQ
authors.lastname: Zhang
authors.forename: Sai-Feng
authors.initials: SF
authors.lastname: Xue
authors.forename: Zhu
authors.initials: Z
authors.lastname: Tao