Dimethyl N,N'-Bis(endo-himmoyl)-(R,R)-cystine

The title compound, C₂₆H₂₈N₂O₈S₂, contains two norbornene rings both with endo-substituents, and an (M)-helical disulfide. Both ester groups adopt the s-cis conformation, and the bond lengths and angles are within the expected values.