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Acknowledgements
We are grateful to K. Yamaguchi and K. Yoneharafor discussions. This work was supported
by the Core Research for Revolutional Science and Technology program of the Japan
Science and Technology Agency, the Global COE Program Chemistry Innovation through
Cooperation of Science and Engineering, the Development in a New Interdisciplinary Field
Based on Nanotechnology and Materials Science Programs and a Grant-in-Aid for
Scientific Research from the Ministry of Education, Culture, Science, Sports and
Technology of Japan.
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Author contributions
K.K. and N.M. conceived and designed the experiments. K.K., K.Y. and Y.N. carried out the
experiments. K.U. analysed the crystallographic data. K.K. and N.M. co-wrote the paper.
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Additional information
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