Shing, Tony K. M.; Kwong, Connie S. K.; Cheung, Aries W. C.; Kok, Stanton H.-L.; Yu, Zhifeng; Li, Jianmei; Cheng, Christopher H. K. Journal of the American Chemical Society, 2004, vol. 126, # 49 p. 15990 - 15992 doi: 10.1021/ja0470158