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. 2019 May 10;5(5):eaav4119. doi: 10.1126/sciadv.aav4119

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 2 — (A) Three building blocks of UPF-1: 3-TCPP, BPY, and [Zn₂(COO)₃]₂O. Zn, green; C, gray; N, blue; O, red; all hydrogen and solvents are omitted for clarity. (B) A nanocage of UPF-1 consists of three constituents and is represented by rhombicuboctahedron. The nanocage has 10 linkages, BPY as its pillars and oxo ligands. The oxygen of oxo ligands and BPY are represented by balls (yellow) and rods (orange), respectively. The rhombicuboctahedron and 10 linkages of the structure are simplified to a cuboid form. The vertex of the cuboid is the oxygen of the oxo ligands. (C) Packing system of rhombicuboctahedra and cuboids in UPF-1. The oxo ligands were bent to a clockwise direction. The rods connect between cages in the picture showing the sides of the structure. The connection by rods is omitted because packing of the cuboid emphasizes the connectivity of oxo ligands.