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. Author manuscript; available in PMC: 2021 Jun 21.
Published in final edited form as: Chem Soc Rev. 2020 May 15;49(12):3889–3919. doi: 10.1039/d0cs00038h

Fig. 1.

Fig. 1

Chemical and crystal structures of (a) M73, (b) M70 and (c) M71. Figure adapted from ref. 90–92 with permission from the American Chemical Society, Copyright 2018 and 2019.