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. Author manuscript; available in PMC: 2016 Jun 7.
Published in final edited form as: J Nat Prod. 2008 Jan 17;71(3):300–308. doi: 10.1021/np0703702

Figure 2.

Figure 2

3–21G-calculated manzamine-derived allylic carbonium ion 3a showing a pretransition state transannular H-34 to C-10 distance of 3.43 Å. Of interest, the H-34 to C-10 distance in Figure 1 (manzamine A, 3) is 5.14 Å, the shortened distance arising as a result of conformational transmission.