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. 2013 May 29;18(6):6383–6407. doi: 10.3390/molecules18066383

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© 2013 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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UV-vis spectra of the cylinder 6a and a mixture of 6a and histidine (6 eq.) in CD₃CN/D₂O (97:3). Inset photographs of 6a, 6a + histidine (6 eq.), 8, and 8 + histidine (6 eq.) in CD₃CN/D₂O (97:3).