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. Author manuscript; available in PMC: 2019 Sep 3.
Published in final edited form as: Angew Chem Int Ed Engl. 2018 Aug 10;57(36):11634–11639. doi: 10.1002/anie.201805191

Figure 1:

Figure 1:

Some previously reported routes to C-terminal thioesters and active esters via A[17] MeDBZ cyclization and B [18-22] acyl hydrazide oxidation. C This work.