Figure 3.

(a) Capsule 9 shown in stick bond representation with the diethyl ether guests given in space-filling representation. The orientation of the capsule is identical to that given in Fig. 1a. (b) The trigonal antiprism that results from connection of the centroids of the centers of the aromatic rings of macrocycle 5. The top (and bottom) equilateral triangular faces possess edge lengths of 12.43 Å, while the edge lengths of the isosceles side triangles is 9.51 Å. (c) Superposition of the trigonal antiprism and capsule.