title: 3,3,6,6-Tetra-methyl-9-(2-nitro-phen-yl)-3,4,6,7-tetra-hydro-2H-xanthene-1,8(5H,9H)-dione.
abstract: In the title compound, C(23)H(25)NO(5), the pyran ring adopts a flattened boat conformation, while the two cyclo-hexenone rings are in envelope conformations. The 3-nitro-phenyl ring is almost perpendicular to the pyran ring, making a dihedral angle of 87.1 (3)°.
authors: Department of Enviromental and Chemistry Engineering, Tianjin Polytechnic University, State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin 300160, People's Republic of China.
authors: Yingming
authors: Y
authors: Mo
authors: Hong-Jun
authors: HJ
authors: Zang
authors: Bo-Wen
authors: BW
authors: Cheng
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