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nancial supports. And we also thank Prof. Liang-Nian He from 12 X.-W. Li, A. R. Chianese, T. Vogel and R. T. Carbtree, Org.
Nankai University for the help on EI-HRMS test.
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13 M. Nakamura, L. Ilies, S. Otsubo and E. Nakamura, Angew.
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T. Sakamoto, Tetrahedron, 2005, 61, 10958; (b)
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