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Acknowledgements
This work was supported by the Fonds der Chemischen Industrie. The authors thank
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`
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Author contributions
S.K. and F.E.Z. performed the experimental work. S.K. and F.E.Z. evaluated the data. J.P.A.
carried out the theoretical calculations and analyses. J.P.A. and S.K. performed the kinetics
and coupling calculations. M.T.R., S.K. and J.P.A. wrote the manuscript.
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Additional information
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