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. Author manuscript; available in PMC: 2016 Dec 21.
Published in final edited form as: Angew Chem Int Ed Engl. 2015 Nov 16;54(52):15705–15710. doi: 10.1002/anie.201507418

Figure 3.

Figure 3

Confirmation of karlotoxin structural revision using DP4 calculations. Four diastereomers investigating the relative configuration revision at C49 and C41 based on the amphidinol 3 revision. Original JBCA for 1. 3J(C50, H48) value of 3.5 Hz is considered an “intermediate” value resulting in the misassignment of C49. The “large” value for 3J(H42, H41) leads to an unambiguous assignment of configuration.