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. 2021 Aug 27;26(17):5214. doi: 10.3390/molecules26175214

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© 2021 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 2 — Synthetic pathway of the dipolarophile (2).