. 2009 Jul 8;14(7):2431–2446. doi: 10.3390/molecules14072431
© 2009 by the authors;
licensee Molecular Diversity Preservation International, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
Scheme 1.
The synthesis of compounds 1 - 9a-c.