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(a) Schematic representation of the synthesis of molecular cage-based crystalline covalent organic frameworks (cage-COFs) by reacting D3h-symmetric organic cage with p-phenylenediamine and benzidine through acid-catalyzed Schiff base condensation. Structural representations for (b) side and (c) top view of cage-COF-1. Reprinted from ref (7j). Copyright 2019 American Chemical Society.
