. 2017 Mar 21;55(1):1436–1441. doi: 10.1080/13880209.2017.1304426
© 2017 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
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 1.
Modified reactions of betunilic acid (2).