title: 3,9-Dimethyl-3,9-bis-(4-nitro-phen-yl)-2,4,8,10-tetra-oxaspiro-[5.5]undeca-ne.
abstract: In the title compound, C(21)H(22)N(2)O(8), both of the nonplanar six-membered heterocycles adopt chair conformations. The dihedral angle between the terminal benzene rings is 58.22 (11)°. Weak inter-molecular C-H⋯O inter-actions are observed in the crystal structure.
authors.forename: Xiaoqiang
authors.initials: X
authors.lastname: Sun
authors.forename: Bin
authors.initials: B
authors.lastname: Yu
authors.forename: Xiuqin
authors.initials: X
authors.lastname: Zhang
authors.forename: Xuqiang
authors.initials: X
authors.lastname: Chao
authors.forename: Qiang
authors.initials: Q
authors.lastname: Chen