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. 2015 Sep 3;20(9):16186–16220. doi: 10.3390/molecules200916186

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© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 21 — Different hypoxia tracers [¹⁸F]70–[¹⁸F]72 with diverging metabolic stability [135] and an example for biomacromalecule [¹⁸F]73 labeled with SiFa [131].