. 2009 Dec 1;14(12):4973–4986. doi: 10.3390/molecules14124973
© 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 2.
Proposed mechanism for formation of 4g’ and 4h’.