title: Crystal structure of 10a-hy-droxy-9-(3-nitro-phen-yl)-3,6-diphenyl-3,4,5,6,7,8a,9,10a-octa-hydro-1H-xanthene-1,8(2H)-dione.
abstract: In the octa-hydroxanthenedione unit of the title compound, C31H27NO6, the central di-hydro-pyran ring shows an envelope conformation, while the bilateral cyclo-hexene and cyclo-hexane rings adopt a half-boat conformation and a chair conformation, respectively. The nitro-benzene ring is twisted with respect to the two benzene rings, making dihedral angles of 63.1 (1) and 63.0 (1)°. In the crystal, O-H⋯O hydrogen bonds link the mol-ecules into supra-molecular chains propagating along the a-axis direction.
authors: Jiangsu University of Science and Technology, Zhenjiang 212003, People's Republic of China.
authors: Xin-Yuan
authors: XY
authors: Zhang
authors: Jiangsu University of Science and Technology, Zhenjiang 212003, People's Republic of China.
authors: Bing-Xiang
authors: BX
authors: Hu
authors: Jiangsu University of Science and Technology, Zhenjiang 212003, People's Republic of China.
authors: Ze-Yu
authors: ZY
authors: Zhou
authors: Jiangsu University of Science and Technology, Zhenjiang 212003, People's Republic of China.
authors: Lei
authors: L
authors: Zhou
authors: Jiangsu University of Science and Technology, Zhenjiang 212003, People's Republic of China.
authors: Fang-Ming
authors: FM
authors: Wang
keywords: crystal structure; hydrogen bonding; xanthene