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. 2015 Mar 17;20(3):4874–4901. doi: 10.3390/molecules20034874

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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 25 — Proposed mechanisms for the regioselective direct arylation of DMU [59,61].