. 2019 Aug 29;84(18):11493–11512. doi: 10.1021/acs.joc.9b01253
Copyright © 2019 American Chemical
Society
This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Figure 2.
Ring B structures synthesized.