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Ack n ow led gm en t. We thank Prof. Dr. J . Sonnen-
bichler and Dr. I. Sonnenbichler (Max-Planck-Institut fu¨r
Biochemie, Martinsried, Germany) for the NMR spectra,
Prof. Dr. W. Scha¨fer and I. Buhrow (Max-Planck-Institut
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spectra, and Dr. D. Stephenson (Institut fu¨r Organische
Chemie der LMU Mu¨nchen, Mu¨nchen, Germany) for
helpful discussions concerning the NMR spectra.
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