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3. (b) H. Ishitani, Y. Saito, Y. Nakamura, W.-J. Yoo, S. Kobayashi, Asian J. Org. Chem., 7, 2061 (2018)
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5. (d) M. B. Plutschack, B. Pieber, K. Gilmore, P. H. Seeberger, Chem. Rev., 117, 11796 (2017)