1. M. Yasunami, T. Amemiya, and K. Takase, Tetrahedron Lett., in press.
2. M. Yasunami, A. Takagi, and K. Takase, Chemistry Lett., in press.
3. Recently, X-Ray diffraction analysis of this compound was accomplished supporting the assigned structure: C. Kabuto, K. Fujimori, N. Morita, M. Yasunami, T. Asao, and K. Takase, Acta Crystallographica, in press.