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. 2020 May 8;12(5):433. doi: 10.3390/pharmaceutics12050433

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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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Molecular structures of (a) ketoprofen, (b) polyvinyl alcohol (PVAlcohol), (c) polyvinyl pyrrolidone (PVP), (d) polyvinyl acetate phthalate (PVAP), (e) polyvinyl pyrrolidone vinyl acetate (VP:VA), (f) polyvinyl acetate (PVAcetate).