5-Methyl­spiro­[indoline-3,7′-[6H,7H,8H]pyrano[3,2-c:5,6-c′]di[1]benzopyran]-2,6′,8′-trione chloroform hemisolvate

In the title compound, C(27)H(15)NO(6)·0.5CHCl(3), the central pyran ring and both the benzopyran systems are planar, with the dihedral angle between the outer rings being 3.24 (6)°. The indolin-2-one system is in a perpendicular configuration with respect to the pyran ring [dihedral angle = 87.58 (2)°]. Supra­molecular layers in the ac plane are formed in the crystal structure whereby inversion-related mol­ecules are connected by N—H⋯O hydrogen bonds. These are further linked by C—H⋯O inter­actions, forming a supra­molecular layer in the ac plane. Disordered CHCl(3) solvent in the structure was modelled with the SQUEEZE routine in PLATON [Spek (2009 ▶). Acta Cryst. D65, 148–155].