Ethyl 2-amino-7,7-dimethyl-2′,5-dioxospiro[5,6,7,8-tetrahydro-4H-chromene-4,3′(2′H)-1H-indole]-3-carboxylate

In the molecule of the title compound, C21H22N2O5, the indole system and the spiro-pyran ring are almost planar [maximum deviations of 0.0447 (17) and 0.0781 (17) angstrom, respectively]; the dihedral angle between them is 84.6 (3)degrees. The remaining six-membered ring adopts a twisted conformation. Intramolecular N-H center dot center dot center dot O hydrogen bonds occur. In the crystal structure, interamolecular N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds link the molecules.