Ethyl 2-[1-(4-chloro-phen-yl)-2,5-dioxo-1,2,3,5-tetra-hydro-imidazo[1',2':1,2]pyrimidino[5,4-b][1]benzofuran-3-yl]acetate.

The asymmetric unit of the title compound, C(22)H(16)ClN(3)O(5), consists of two crystallographically independent mol-ecules. The fused rings of the imidazo[1,2-a]benzo[4,5]furo[3,2-d]pyrimidine system are nearly coplanar and the chlorophenyl rings are twisted with respect to the two pyrimidinone ring systems by 71.00 (2) and 62.59 (2)°. The C atoms of the ethyl side chain are disordered and were refined using a split model. In the crystal structure, the mol-ecules are connected via weak intra- and inter-molecular C-H⋯O inter-actions are present. The ethyl group in one molecule is disordered over two positions, with site occupancy factors 0.55 and 0.45; in the other molecule only the methyl group is disordered over two positions, with site occupancy factors 0.6 and 0.4.