title: 3-tert-Butyl 5-methyl (2R,4S,5R)-2-(4-methoxyphenyl)-4-(3-nitrophenyl)-1,3-oxazolidine-3,5-dicarboxylate.
abstract: The title mol-ecule, C(23)H(26)N(2)O(8), was synthesized in three steps starting from m-nitro-cinnamic acid. The central oxazolidine ring adopts an almost perfect envelope conformation with the O atom as the flap [puckering parameter ϕ = 0.3 (6)°]. The dihedral angle formed by the benzene rings is 61.81 (9)°. In the crystal, mol-ecules are connected into double chains parallel to [010] by C-H⋯O hydrogen bonds. The absolute configuration was assigned from the synthetic procedure.
authors.affiliation: Benemérita Universidad Autónoma de Puebla, Facultad de Ciencias Químicas, Ciudad Universitaria, Puebla, Pue. 72570,  Mexico.
authors.forename: Sara
authors.initials: S
authors.lastname: Montiel-Smith
authors.forename: Sylvain
authors.initials: S
authors.lastname: Bernès
authors.forename: Jesús
authors.initials: J
authors.lastname: Sandoval-Ramírez
authors.forename: Socorro
authors.initials: S
authors.lastname: Meza-Reyes
authors.forename: Joëlle
authors.initials: J
authors.lastname: Dubois