title: Ethyl 4-(2-eth-oxy-2-oxoeth-yl)-3-oxo-4,13-di-aza-penta-cyclo-[11.8.0.0(2,11).0(5,10).0(14,19)]henicosa-1,5(10),6,8,11,14(19),15,17,20-nona-ene-12-carboxyl-ate.
abstract: In the title compound, C26H22N2O5, the system consisting of five fused rings, being essentially planar with an r.m.s. deviation from the least-squares plane of 0.049 (3) Å, makes a dihedral angle of 58.72 (12)° with the plane of the ethyl carboxyl-ate group immediately attached to it, and a dihedral angle of 89.48 (14)° with the plane of the ethyl carboxyl-ate group attached via the -CH2- bridge. Bond lengths indicate π-delocalization over the whole penta-cyclic system. The mol-ecular conformation is stabilized by a weak intra-molecular C-H⋯O hydrogen bond. In the crystal, mol-ecules form stacks along the b-axis direction, neighboring mol-ecules within each stack being related by inversion and the shortest distance between the centroids of the pyridine rings within the stack being 3.667 (2) Å.
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China.
authors.forename: Qing-Hua
authors.initials: QH
authors.lastname: Meng
authors.forename: Ya-Nan
authors.initials: YN
authors.lastname: Wu
authors.forename: Ke
authors.initials: K
authors.lastname: Jiang
authors.forename: Yun
authors.initials: Y
authors.lastname: Liu
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