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. 2020 Jul 23;13(15):3277. doi: 10.3390/ma13153277

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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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Chemical structures of poly(ethylene glycol) methacrylate (PEGMA), poly(ethylene glycol) dimethacrylate (PEGDMA), 2,2-dimethoxy-2-phenylacetophenone (DMPA), and cyclopentane-N,N′-dicyclohexylcarbo diimide (C-PenDCC).