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. 2017 Aug 11;22(8):1326. doi: 10.3390/molecules22081326

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© 2017 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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UV-visible absorption spectra of W in aqueous solutions at different pH values from 2–10 in water and inside the cavities of HE-β-CD, Ac-β-CD, and Me-β-CD. The experimental fitting errors for the labeled pK_a values and the corresponding spectra are shown in Figure S2, Supporting Information.