(4) Conformational analyses of all 43 pathways of xylene, dioxane, and naphthalene at 298 K showed that Octacid4 adopted exclusively a cluster of V-shaped conformations to gulp its guests. These V-shaped conformations have the mean C17a-C6b distances (see Fig. for definitions of C17a and C6b) of 7.0 Å (95% confidence interval: 7.0-7.1 Å) for the width of the entrance portal and 5.6 Å (95% confidence interval: 5.5-5.7 Å) for the width of the opposing portal (Table ), which are consistent with the reported V-shaped conformation proposed for the sliding-door mechanism for the gating of hemicarcerands that are closely related to Octacid4.