Alanine, Alexander; Bourson, Anne; Buettelmann, Bernd; Gill, Ramanjit; Heitz, Marie-Paule; Mutel, Vincent; Pinard, Emmanuel; Trube, Gerhard; Wyler, Rene Bioorganic and Medicinal Chemistry Letters, 2003 , vol. 13, # 19 p. 3155 - 3159