title: Diethyl trans-2,5-bis-(4-methoxy-benzyl-sulfan-yl)-1,4-dimethyl-3,6-dioxopiperazine-2,5-carboxyl-ate.
abstract: The title compound, C(28)H(34)N(2)O(8)S(2), was synthesized as part of a project to develop synthetic routes to analogues of sporidesmins, a class of secondary metabolite produced by the filamentous fungi Chaetomium and Pithomyces sp. The complete molecule is generated by crystallographic inversion symmetry: the methoxy group is essentially coplanar with the benzene ring to which it is bonded, a mean plane fitted through the non-H atoms of the aromatic ring and the meth-oxy group having an r.m.s. deviation of 0.0140 Å. Similarly, the ester group is also essentially planar (r.m.s. deviation of a plane fitted through all non-H atoms is 0.0101 Å). There is only one independent C-H⋯O inter-action, which links together adjacent mol-ecules into a two-dimensional sheet in the bc plane.
authors.affiliation: Department of Chemistry and Biochemistry, The University of Arizona, 1306 E. University Boulevard, Tucson, AZ 85721, USA.
authors.forename: Nathan W
authors.initials: NW
authors.lastname: Polaske
authors.forename: Gary S
authors.initials: GS
authors.lastname: Nichol
authors.forename: Bogdan
authors.initials: B
authors.lastname: Olenyuk