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. 2023 May 12;24(10):8701. doi: 10.3390/ijms24108701

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Structure of ²¹¹At-FAPI and ¹³¹I-FAPI compounds. (a) ²¹¹At-labeled PEG linker FAPI(s) were numbered from 1 to 4 according to their structural complexity. (b) ¹³¹I-labeled PEG linker compound. (c) PIP linker compound. PIP linker compound was synthesized based on the already reported compound for comparison with the PEG linker compound.