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. Author manuscript; available in PMC: 2010 Jan 1.
Published in final edited form as: Angew Chem Int Ed Engl. 2009;48(31):5648–5652. doi: 10.1002/anie.200902029

Figure 2.

Figure 2

Key 1H NMR coupling constants for tricyclic intermediates 9 (JH25,21 = 1.0 Hz), 9a (JH25,21 = 10.0 Hz), 9b (JH25,21 = 3.5 Hz), and 9c (JH25,21 < 1.0 Hz) (top), and X-ray derived ORTEP drawing of tetraol 9d (bottom).