title: 8,8-Dimethyl-8,9-dihydro-7H-chromeno[2,3-b]quinoline-10,12-dione.
abstract: In the title compound, C(18)H(15)NO(3), the fused benzopyran and pyridine rings are essentially coplanar [r.m.s. deviation = 0.0533 Å with a maximum deviation of 0.080 (1) Å for a benzene C atom]. The cyclo-hexa-none ring adopts an envelope conformation with the dimethyl-substituted C atom 0.660 (2) Å out of the plane formed by the remaining ring atoms (r.m.s. deviation = 0.0305 Å). The dihedral angle between the mean planes of the pyran and cyclo-hexa-none rings is 12.95 (6)°. In the crystal, mol-ecules are linked via C-H⋯O hydrogen bonds, leading to chains running along [011].
authors: Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025,  India.
authors: Thothadri
authors: T
authors: Srinivasan
authors: Panneerselvam
authors: P
authors: Yuvaraj
authors: Boreddy S R
authors: BS
authors: Reddy
authors: Devadasan
authors: D
authors: Velmurugan