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In the mol­ecule of the title compound, C 21 H 22 N 2 O 5 , the indole system and the spiro-pyran ring are almost planar [maximum deviations of 0.0447 (17) and 0.0781 (17) Å, respectively]; the dihedral angle between them is 84.6 (3)°. The remaining six-membered ring adopts a twisted conformation. Intra­molecular N—H⋯O hydrogen bonds occur. In the crystal structure, intera­molecular N—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules.

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