title: 3'-[Hy-droxy(4-oxo-4H-chromen-3-yl)meth-yl]-2-oxospiro-[indoline-3,2'-pyrrolidine]-3'-carbonitrile.
abstract: In the title compound, C(23)H(19)N(3)O(4), the pyran ring adopts a half-chair conformation, while the pyrrolidine (with a C atom as the flap atom) and the five-membered ring in the indoline (with a C atom as the flap atom) ring system adopt slight envelope conformations. The pyrrolidine ring makes dihedral angles of 83.3 (1) and 60.4 (1)° with the mean plane through all non-H atoms of the indoline and chromene ring systems, respectively. In the crystal, mol-ecules are connected by two unique N-H⋯O and O-H⋯O hydrogen-bonding inter-actions, which form centrosymmetric patterns described by graph-set motifs R(2) (2)(18) and R(2) (2)(14). These two motifs combine to form a hydrogen-bonded chain which propagates in the a-axis direction. The crystal structure is also stablized by C-H⋯O inter-actions and by aromatic π-π stacking inter-actions between the pyran and benzene rings of neighbouring mol-ecules [centroid-centroid distance = 3.755 (1) Å and slippage = 1.371 (2) Å].
authors.forename: E
authors.initials: E
authors.lastname: Govindan
authors.forename: K
authors.initials: K
authors.lastname: Sakthimurugesan
authors.forename: A
authors.initials: A
authors.lastname: Subbiahpandi
authors.forename: P
authors.initials: P
authors.lastname: Yuvaraj
authors.forename: Boreddy S R
authors.initials: BS
authors.lastname: Reddy