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Acknowledgments
10. R.M.E. Greene, J.G. Hamilton, K.J. Ivin, and J.J. Rooney.
This work was supported by the Hungarian Science Foun-
dation under grants No. T35221 and T016326. L.M. thanks
the Department of Chemistry and Biochemistry, University
of Regina (Saskatchewan) for the granting of a sabbatical
leave and the Department of Organic Chemistry, University
of Veszprém (Hungary) for the invitation.
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