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. Author manuscript; available in PMC: 2013 Jul 20.
Published in final edited form as: J Org Chem. 2012 Jul 3;77(14):6066–6075. doi: 10.1021/jo3008622

Figure 1.

Figure 1

a) Planar structure of 1 showing TOCSY correlations from H-2, H-6, H-8, H-10b, H-13, H-17, H-21, H-1′, H-2′ (black circles) indicated as bolded lines and key HMBC correlations represented by single-headed arrows. b) The assignment of geometry around the C-13/C-14 bond in 1 using key ROESY correlations indicated by double-headed arrows.