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. 2022 Feb 22;27(5):1465. doi: 10.3390/molecules27051465

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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 5 — Synthesis of 7-nitro-7H-imidazo[4′,5,5,6]benzo[1,2,3,4]bis([1,2,5]oxadiazole)-3,4-dioxide [18].