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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 1.

Figure 1

Manzamine A (3) global minimum energy by 3–21G ab initio methods. Note the green hydrogen bonds between heterocycle 9-NH, the 12-OH lone pair, and the OH with the tertiary 27-N lone pair.