Crystal structure of 6-(4-chloro-phen-yl)-6a-nitro-6a,6b,8,9,10,12a-hexa-hydro-6,7-spiro[chromeno[3,4-]indolizine-12,11'-indeno-[1,2-]quinoxaline].

The title compound, CHClNO, crystallized with two independent mol-ecules ( and ) in the asymmetric unit. In both mol-ecules, the pyran and pyridine rings adopt envelope and chair conformations, respectively. The conformation of the pyrrolidine and cyclo-pentene rings differ in the two mol-ecules; twisted and flat, respectively, in mol-ecule , but envelope and twisted, respectively, in mol-ecule . In both mol-ecules, there is a C-H⋯N intra-molecular hydrogen bond present. In both mol-ecules, the oxygen atoms of the nitro groups are disordered as is the chlorine atom in mol-ecule . In the crystal, the mol-ecules are linked by C-H⋯O hydrogen bonds, forming chains along [010], and by C-H⋯π inter-actions. The and mol-ecules are also linked by a number of C-H⋯π inter-actions, resulting in the formation a supra-molecular three-dimensional structure. In mol-ecule , the nitro group oxygen atoms are disordered over two positions with refined occupancy ratios of the nitro group oxygen atoms O3 and O4 in 0.59 (2):0.41 (2) while in molecule one of the nitro O atoms is disordered over two positions with a refined occupancy ratio of 0.686 (13):0.314 (13) and the chlorine atoms is disordered over two positions with a refined occupancy ratio of 0.72 (3):0.28 (3).