Fig. 7: Host–guest complexation to build a triple π-stack.
From: Molecular Tetris by sequence-specific stacking of hydrogen bonding molecular clips

Capped-stick representation of the X-ray structure of C-P2⊃PHD with vdW surfaces overlaid on the stacked aromatic regions, and ether chains simplified as wireframes. PHD 1,10-phenanthroline-5,6-dione, vdW van der Waals.