Organic Letters
Letter
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ACKNOWLEDGMENTS
We are grateful to Karin Gottschalk (University of Munster) for
skillful technical assistance. We thank Dr. Chang Guo and Dr.
Lisa Candish (University of Munster) for helpful discussions.
Generous financial support by the Deutsche Forschungsge-
meinschaft (SPP 1179, IRTG2027, Leibniz Award, SFB858) is
gratefully acknowledged.
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