. 2008 Dec 15;13(12):3184–3191. doi: 10.3390/molecules13123184
© 2008 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/).
Figure 1.
Possible chemical conversion of 1 into 2, 3 and 4.