Additional file 5.

Heteronuclear spectroscopy. Heteronuclear spectroscopy detail. A) The HSQC spectrum shows weak long-range coupling which disambiguates highly overlapped proton resonances of H-2 and H-16. The long-range peaks show C-2 to H-1 and C-16 to H-15 connectivities. B) The HMBC spectrum shows a long-range cross-peak between C-13 and H-20.

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Oatis et al. Chemistry Central Journal 2008 2:12   doi:10.1186/1752-153X-2-12