title: Diethyl 4-meth-oxyoxalyl-3,5-diphenyl-pyrrolidine-2,2-dicarboxyl-ate.
abstract: In the title compound, C(25)H(27)NO(7), the pyrrolidine ring exhibits an envelope conformation and the benzene rings form a dihedral angle of 33.47 (11)°. In the crystal, pairs of N-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric dimers. Weak C-H⋯O inter-actions link the dimers into layers parallel to the bc plane.
authors.affiliation: Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637002,  People's Republic of China.
authors.forename: Yan-Qin
authors.initials: YQ
authors.lastname: He
authors.forename: Jin-Quan
authors.initials: JQ
authors.lastname: Chen