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. 2019 Jul 26;8(8):247. doi: 10.3390/antiox8080247

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© 2019 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/).

PMC Copyright notice

The butenolide derivatives of 9-[2(phosphonomethoxy)ethyl]adenine (PMEA) (66) and 9-[2(phosphonomethoxy)ethyl]guanine (PMEG) (67) and the nucleotide containing butenolide 68.