title: 1,2,3-Trimethoxy-5,11-dihydroindolo[1,2-b]isoquinoline-5,11-dione.
abstract: The title compound, C15H19NO5, crystallizes in the monoclinic space group P2(1)/c with four molecules in the asymmetric unit, which differ from each other in the orientation of their methoxy groups. Of the three methoxy groups in each molecule, one lies close to the plane of the molecule and the other two have an out-of-plane conformation where they point in opposite directions. In the crystal structure, four different types of pi-stacks are observed and the molecules pack in two different types of stacking sheets, with alternating molecules A and B in one ribbon and alternating molecules C and D in the other. The supramolecular structure is supported by C-H...O and pi-pi interactions.
authors.affiliation: Department of Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India.
authors.forename: M
authors.initials: M
authors.lastname: Yogavel
authors.forename: D
authors.initials: D
authors.lastname: Velmurugan
authors.forename: W G
authors.initials: WG
authors.lastname: Rajeswaran
authors.forename: P C
authors.initials: PC
authors.lastname: Srinivasan
authors.forename: H K
authors.initials: HK
authors.lastname: Fun