Journal of the American Chemical Society
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Notes: the authors declare no competing financial interest.
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ACKNOWLEDGMENT
We thank Dr. Alexander Filatov and Mr. Andrew McNeece for
obtaining X-ray crystal structures of 4, ent-15, 25, and 37 and
Dr. Antoni Jurkiewicz and Dr. C. Jin Qin for assistance with
NMR and mass spectrometry, respectively. Financial support
came from the University of Chicago and the National Insti-
tutes of Health (NIH R01-124295A).
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