Fig. 40. Schematic representation of the enantiomers of [2]catenanes based on (a) two equivalent C_∞v rings, (b) two equivalent C_1v rings, (c) the syn diastereomer of an achiral [3]catenane with terminal C_∞v rings, (d) one enantiomer of a linear [4]catenane with terminal C_∞v rings.