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. Author manuscript; available in PMC: 2014 Sep 11.
Published in final edited form as: J Am Chem Soc. 2013 Aug 28;135(36):10.1021/ja403412y. doi: 10.1021/ja403412y

Figure 3.

Figure 3

Structure elucidation details of 1 – 4. a) Substructures of 1 (I–IV) with COSY, HMBC correlations. b) ORTEP drawing of crystal structure of (−)-1a. c) Key NMR correlations for 3.