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. 2023 Feb 8;7(3):202–224. doi: 10.1038/s41570-023-00463-4

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Fig. 6 — The macrocyclic compounds, which are generally highly positively charged, can contain various different metals such as iron²⁹⁵, lutetium²⁹⁶, palladium²⁹⁷, zinc²⁹⁸ or aluminium²⁹⁹. Ac, acetate.