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. 2023 Mar 8;24(6):5167. doi: 10.3390/ijms24065167

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© 2023 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/).

PMC Copyright notice

Schematic representation of the pH-responsive P5A4-based tandem drug delivery system. Reproduced with the permission of reference [93]. Copyright © American Chemical Society 2022.