title: Tetra-methyl 4,4'-carbonyl-bis(benzene-1,2-dicarboxyl-ate).
abstract: In the mol-ecule of the title compound, C(21)H(18)O(9), the two aromatic rings are aligned at an angle of 49.7 (1)°.
authors.forename: Xin-Yi
authors.initials: XY
authors.lastname: Zhu
authors.forename: Guo-Wei
authors.initials: GW
authors.lastname: Gao
authors.forename: Jian
authors.initials: J
authors.lastname: Men
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng