title: (3R,4R)-2,5-Dioxo-1-m-tolyl-3,4-diyl diacetate.
abstract: In the enanti-omerically pure title compound, C(15)H(15)NO(6), the five-membered ring displays a twist conformation with the local axis through the N atom. The acetyl groups are perpendicular to the ring [dihedral angles 80.3 (1) and 89.3 (1)°] and project to opposite sides. The packing is governed by two weak C-H⋯O inter-actions, forming layers of mol-ecules parallel to the ab plane.
authors.forename: Sara
authors.initials: S
authors.lastname: Naz
authors.forename: Javid
authors.initials: J
authors.lastname: Zaidi
authors.forename: Tahir
authors.initials: T
authors.lastname: Mehmood
authors.forename: Peter G
authors.initials: PG
authors.lastname: Jones