title: 2,2,7,7-Tetra-methyl-1,2,3,6,7,8-hexa-hydro-cinnolino[5,4,3-cde]cinnoline.
abstract: The asymmetric unit of the title compound, C(16)H(20)N(4), contains two half-mol-ecules, which are completed by crystallographic inversion symmetry. The pyridazine rings are conjugated and the cyclo-hexane rings adopt envelope conformations.
authors.forename: Ju-Hua
authors.initials: JH
authors.lastname: Peng
authors.forename: Wen-Juan
authors.initials: WJ
authors.lastname: Hao
authors.forename: Shu-Jiang
authors.initials: SJ
authors.lastname: Tu