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. 2022 Aug 20;23(16):9396. doi: 10.3390/ijms23169396

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© 2022 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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Scheme 9 — Hydroxyalkylation of phenol with formaldehyde to bisphenol F [144]. Reprinted from ref. [144]. Copyright © 2022, with permission from Elsevier.