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. Author manuscript; available in PMC: 2014 Oct 25.
Published in final edited form as: J Nat Prod. 2013 Sep 20;76(10):10.1021/np400531b. doi: 10.1021/np400531b

Figure 8.

Figure 8

Relative energies of fragments calculated using Q-Chem (B3LYP-6-31+G* level). Energies for 16, 17, 18, 20 and 21 include the lost neutral radical fragment (i.e., Pr• or Bu•).