Crystal structure of 6-(4-chloro-phen-yl)-6a-nitro-6,6a,6b,7,9,11a-hexa-hydro-spiro[chromeno[3',4':3,4]pyrrolo-[1,2-c]thia-zole-11,11'-indeno-[1,2-b]quinoxaline] chloro-form monosolvate.

In the title compound, C33H23ClN4O3S·CHCl3, the thia-zole ring adopts an envelope conformation with the N atom as the flap, and the pyrrolidine ring adopts a half-chair conformation. The thia-zole ring mean plane makes a dihedral angle of 59.31 (1)° with the pyrrolidine ring mean plane, 71.67 (1)° with the chromene ring and 82.59 (1)° with the chloro-benzene ring. An intra-molecular C-H⋯N hydrogen bond occurs. In the crystal, a second C-H⋯N hydrogen bond links the main and solvent mol-ecules. The solvent chloroform molecule is disordered about two positions with an occupancy ratio of 0.508 (14):0.492 (14).