. 2019 Jun 12;21(12):4433–4438. doi: 10.1021/acs.orglett.9b01115
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 3.
X-ray structures of 16 (16-Sa and 16-Ra).