title: Diethyl 2,6-(2,4-dichloro-phen-yl)-4,8-dioxo-2,3,6,7-tetra-hydro-1H,5H-2,3a,4a,6,7a,8a-hexa-azacyclo-penta-[def]fluorene-8b,8c-dicarboxyl-ate.
abstract: The title mol-ecule, C(28)H(28)Cl(4)N(6)O(6), is built up from four fused rings, viz. two nearly planar imidazole five-membered rings which adopt envelope conformations with the C=O groups at the flap position, and two triazine six-membered rings which adopt chair conformations. Each six-membered ring has a 2,4-dichloro-benzyl substituent attached to an N atom. In the mol-ecule, the two ethyl groups are each disordered between two orientations in 0.784 (16)/0.216 (16) and 0.631 (10)/0.37 (10) ratios. Weak inter-molecular C-H⋯O hydrogen bonds help to stabilize the crystal packing.
authors.affiliation: Key Laboratory of Pesticides and Chemical Biology of the Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China.
authors.forename: Jiao-Yang
authors.initials: JY
authors.lastname: Ding
authors.forename: Xiao-Jie
authors.initials: XJ
authors.lastname: Ren
authors.forename: Yan-Ping
authors.initials: YP
authors.lastname: Zhu
authors.forename: Neng-Fang
authors.initials: NF
authors.lastname: She
authors.forename: An-Xin
authors.initials: AX
authors.lastname: Wu