title: 9,9-Dimethyl-12-(4-nitro-phen-yl)-9,10-dihydro-12H-benzo[a]xanthen-11(8H)-one.
abstract: In the mol-ecular structure of the title compound, C(25)H(21)NO(4), the pyran ring adopts a flattened boat conformation, while the cyclo-hexenone ring is in an envelope conformation. The 4-nitro-phenyl ring is almost perpendicular to the pyran ring [dihedral angle = 89.39 (1)°]. In the crystal, mol-ecules are connected by inter-molecular C-H⋯O hydrogen bonds.
authors.affiliation: Department of Chemistry, Tangshan Normal College, Tangshan 063000, People's Republic of China.
authors.forename: De-Ling
authors.initials: DL
authors.lastname: Li
authors.forename: Li-Hong
authors.initials: LH
authors.lastname: Wang