title: Ethyl 4-(4-nitro-phen-yl)-2-(trifluoro-meth-yl)pyrimido[1,2-a]benzimidazole-3-carboxyl-ate.
abstract: In the title compound, C(20)H(13)F(3)N(4)O(4), the fused pyrimido[1,2-a]benzimidazole ring system is nearly planar, with a maximum deviation from the mean plane of 0.126 (1) Å. Mol-ecules are linked by C-H⋯N and C-H⋯O hydrogen bonds and by π-π inter-actions with inter-planar distances of 3.2661 (6) and 3.2775 (6) Å.
authors.forename: Feng-Ling
authors.initials: FL
authors.lastname: Yang
authors.forename: Gong-Chun
authors.initials: GC
authors.lastname: Li
authors.forename: Chang-Sheng
authors.initials: CS
authors.lastname: Yao