title: rac-(6S)-6-Hy-droxy-6-{2-[2-(propan-2-yl-idene)hydrazinyl-idene]prop-yl}indolo[2,1-b]quinazolin-12(6H)-one.
abstract: The chiral title compound, C(21)H(20)N(4)O(2), crystallizes as a racemic mixture. In the crystal, mol-ecules form centrosymmetric π-overlapping dimers [inter-planar distance = 3.338 (6) Å], which are further connected along the a axis forming centrosymmetric dimers via O-H⋯N hydrogen bonds. C-H⋯O inter-actions are also observed. The indolo[2,1-b]quinazoline group is somewhat bent, with a small dihedral angle of 6.3 (4)° between the plane of the quinazoline system and the plane of the benzene ring of the indole moiety. The C=N-N=C atoms of the azine group is oriented almost perpendicular [84.1 (2)°] to the mean plane of the quinazoline system.
authors: Department of Chemistry and Biochemistry, University of Minnesota Duluth, 1039 University Drive, Duluth, MN 55812,  USA.
authors: Matthew E
authors: ME
authors: Rodstein
authors: Paul D
authors: PD
authors: Steffen
authors: Bogdana
authors: B
authors: Krivogorsky
authors: Peter
authors: P
authors: Grundt