Ishii, Akira; Hojo, Hironobu; Kobayashi, Aki; Nakamura, Kazuhiko; Nakahara, Yuko; Ito, Yukishige; Nakahara, Yoshiaki Tetrahedron, 2000, vol. 56, # 34 p. 6235 - 6243 doi: 10.1016/S0040-4020(00)00588-3