. 2019 Aug 11;34(1):1400–1413. doi: 10.1080/14756366.2019.1651315
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This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Scheme 3.
Synthesis and structures of compounds 22–38.