title: 3,3'-Di-tert-butyl-1,1'-[1,3-phenyl-enebis(methyl-ene)]diurea.
abstract: The title compound, C(18)H(30)N(4)O(2), contains two tert-butyl urea groups, each connected to a benzene ring though a methyl-ene group. One of the groups occupies a position almost normal to the aromatic plane with a C-N-C-C torsion angle of -94.4 (4)°, while the other is considerably twisted from the ring with a C-N-C-C torsion angle of -136.1 (4)°. In the crystal, pairs of mol-ecules are connected to each other, forming centrosymmetric dimers in which two NH groups of one mol-ecule act as hydrogen-bond donors to one carbonyl O atom of the other mol-ecule. The dimers are linked into sheets parallel to (100) by N-H⋯O hydrogen bonds involving the remaining N-H and C=O groups.
authors.forename: Musabbir A
authors.initials: MA
authors.lastname: Saeed
authors.forename: Frank R
authors.initials: FR
authors.lastname: Fronczek
authors.forename: Md Alamgir
authors.initials: MA
authors.lastname: Hossain