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. 2021 May 31;12:3252. doi: 10.1038/s41467-021-23192-y

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© The Author(s) 2021

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Fig. 2 — Structural representations of heterometallic complexes reported for cyclic ester ROP, where alkali metals are combined with di-, tri- and tetravalent heterometals and trivalent Al is combined with divalent metals. ^aIn 12c, one Ca bridges two (salen)AlCl complexes with each ligand retaining one phenolic OH group.