title: Ethyl 6'-amino-5'-cyano-2'-methyl-2-oxospiro-[indoline-3,4'-pyran]-3'-carboxyl-ate.
abstract: In the title compound, C(17)H(15)N(3)O(4), the atoms of the spiro pyran ring are nearly planar with a maximum deviation of 0.0188 (14) Å. The benzene and pyrrole rings make a dihedral angle of 5.71 (6)°. The indole system and the pyran ring are oriented at a dihedral angle of 82.94 (3)°. The crystal structure is stabilized by inter-molecular classical and non-classical N-H⋯O, N-H⋯N and C-H⋯O hydrogen bonds.
authors.affiliation: Department of Chemistry, Xuzhou Medical College, Xuzhou 221004, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Song-Lei
authors.initials: SL
authors.lastname: Zhu