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(a) The Hirshfeld surface of (I) mapped over d norm. Short and long contacts are indicated as red and blue spots, respectively. Contacts with distances approximately equal to the sum of the van der Waals radii are colored white. (b) Weak π–π interactions are shown as green dashed lines on a surface mapped over curvedness. The π–π stacking is indicated by the green flat regions surrounded by dark blue edges.
