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. 2012 Nov 21;10(11):2608–2617. doi: 10.3390/md10112608

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© 2012 by the authors; licensee MDPI, 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/).

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Correlation spectroscopy (COSY) or total correlation spectroscopy (TOCSY) and heteronuclear multiple bond correlation (HMBC) correlations of compounds 1 and 2.