. 2013 May 9;2013:342352. doi: 10.1155/2013/342352
Copyright © 2013 Chanyapat Sangsuwon et al.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 2.
Structures of 1–8.