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. Author manuscript; available in PMC: 2013 May 7.
Published in final edited form as: Chemistry. 2012 Mar 30;18(19):5826–5831. doi: 10.1002/chem.201200629

Figure 1.

Figure 1

Structures of indolizidine 1, pyrrolo[1,2-a]azepine 2, and pyrrolo[1,2-a]azocine 3 alkaloid cores and natural products 4–9 that possess these azabicyclic ring systems.[1–7]