Yokoyama, Masataka; Irie, Masakazu; Sujino, Keiko; Kagemoto, Tsukusi; Togo, Hideo; Funabashi, Masuo Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1992 , # 16 p. 2127 - 2134