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. 2020 May 30;9(6):292. doi: 10.3390/antibiotics9060292

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — Experimental protocol to obtain compound 2. Reagents and reaction condition: (a) anhydrous dimethylformamide (DMF) as a solvent, anhydrous K₂CO₃, magnetic stirring, r.t., 30 min; CH₃I (10 mmoles excess), magnetic stirring, r.t., 7 days.