title: rac-7-[(2E)-But-2-eno-yl]-13-chloro-N-cyclo-hexyl-7,8-dihydro-5H-isochromeno[4,3-c]phenanthridine-8-carboxamide.
abstract: In the title compound, C(31)H(29)ClN(2)O(3), the two heterocyclic rings, belonging to a system of five condensed rings, adopt conformations intermediate between twist-boat and sofa. The secondary amide group is involved in a weak intramolecular N-H⋯N hydrogen bond. In the crystal, molecules are linked by pairs of C-H⋯Cl hydrogen bonds to form inversion dimers. These dimers are linked via a C-H⋯O interaction to form chains propagating along the b-axis direction.
authors.affiliation: Laboratory of Asymmetric Catalysis and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310027,  People's Republic of China.
authors.forename: Ning
authors.initials: N
authors.lastname: Ye
authors.forename: Jin-Long
authors.initials: JL
authors.lastname: Wu