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. Author manuscript; available in PMC: 2011 Jan 22.
Published in final edited form as: J Nat Prod. 2010 Jan;73(1):60–66. doi: 10.1021/np900622m

Figure 2.

Figure 2

1H NMR comparison of chemical shifts for the S-PGME derivative of the herbamide B fragment (A), the S-PGME derivative of the barbamide fragment (B), and the R-PGME derivative of the barbamide fragment (C). The S-PGME derivative of the herbamide B fragment directly overlaps with the S-PGME derivative of the barbamide fragment and has distinctive shift differences from the R-PGME derivative of the barbamide fragment, indicating that herbamide B (3) and barbamide have the same configuration at this center.