Fig. 2: Single crystal structure of molecular organic cage (R)-PTC-1(2H).
From: Elucidating heterogeneous photocatalytic superiority of microporous porphyrin organic cage

a Side view and b top view; c window-to-window stacking mode of neighboring molecular organic cages; d packing profile along the direction of [001] (porphyrin C, gray; cyclohexanediamine C, red; N, blue; H, green; yellow tubes and balls represent the open one-dimensional channel and window, respectively; all selected hydrogen atoms omitted for clarity).