Schuetz, Johannes; Windisch, Petra; Kristeva, Elka; Wurst, Klaus; Ongania, Karl-Hans; Horvath, Ulrike E. I.; Schottenberger, Herwig; Laus, Gerhard; Schmidhammer, Helmut Journal of Organic Chemistry, 2005, vol. 70, # 13 p. 5323 - 5326 doi: 10.1021/jo050362v