Katano, Kiyoaki; An, Haoyun; Aoyagi, Yoshiaki; Overhand, Mark; Sucheck, Steven J.; Stevens Jr., William C.; Hess, Cynthia D.; Zhou, Xiang; Hecht, Sidney M. Journal of the American Chemical Society, 1998, vol. 120, # 44 p. 11285 - 11296 doi: 10.1021/ja9819458