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. 2014 May 21;19(5):6534–6582. doi: 10.3390/molecules19056534

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© 2014 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/3.0/).

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Scheme 34 — Synthesis of ketolactones by oxidative cleavage of β-hydroxytetrahydrofurans [133,134].