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. Author manuscript; available in PMC: 2013 Sep 17.
Published in final edited form as: Angew Chem Int Ed Engl. 2012 Aug 24;51(38):9576–9580. doi: 10.1002/anie.201204977

Figure 1.

Figure 1

Structurally complex rearranged spongian diterpenes (A), previous synthetic efforts (B and C), and current synthetic approach (D). TMS = trimethylsilyl. TBS = tert-butyldimethylsilyl.