Crystal structure of 4-[(1R,2S,5R)-2-isopropyl-5-methyl-cyclo-hex-yl] 2-methyl (2S,4S,5R)-1-[(2S,3R,5R)-5-meth-oxy-carbonyl-2-(2-methyl-phen-yl)pyrrolidine-3-carbon-yl]-5-(2-methyl-phen-yl)pyrrolidine-2,4-di-carboxyl-ate.

The title compound, C38H50N2O7, represents a chiral β-proline dipeptide. Corresponding stereogenic centres of constituting pyrrolidine units have opposite absolute configurations. The central amide fragment is planar within 0.1 Å and adopts a Z configuration along the N-CO bond. In the crystal, the hydrogen atoms of the methyl-ene groups form several short inter-molecular C-H⋯O contacts with the carbonyl oxygen atoms of an adjacent mol-ecule. The only active amino hydrogen atom is not involved in hydrogen bonding.