(3RS)‐2′‐Amino‐2,5′‐dioxo‐1,2‐dihydro‐5′H‐spiro[indole‐3,4′‐pyrano[3,2‐c]chromene]‐3′‐carbonitrile

The title compound, C20H11N3O4, was synthesized by one‐pot reaction of isatin, malononitrile and 4‐hydroxycoumarin in water. In the title molecule, the angle between the pyran plane and the indole ring system with a common spiro C atom is 88.23 (8)°. The molecules are linked into a three‐dimensional framework by the formation of moderate N—H...O and N—H...N hydrogen bonds.