title: Diethyl 2-tert-butyl-4,11-dioxo-2,3-di-hydro-cis-1H,5H,10H-2,3a,4a,10a,11a-penta-azabenzo[f]indeno[2,1,7-ija]azulene-11b,11c-dicarboxyl-ate.
abstract: In the title mol-ecule, C(24)H(31)N(5)O(6), the two ethyl fragments are each disordered over two conformations [occupancy ratios 0.58 (13)/0.42 (13) and 0.56 (12)/0.44 (12)]. The crystal packing exhibits inter-molecular non-classical C-H⋯O hydrogen bonds and π-π inter-actions between benzene rings [centroid-centroid distances = 3.836 (5) Å].
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: Yanping
authors.initials: Y
authors.lastname: Zhu
authors.forename: Yichong
authors.initials: Y
authors.lastname: Sun
authors.forename: Mingqiang
authors.initials: M
authors.lastname: Qiu