Sifferlen, Thierry; Koberstein, Ralf; Cottreel, Emmanuelle; Boller, Amandine; Weller, Thomas; Gatfield, John; Brisbare-Roch, Catherine; Jenck, Francois; Boss, Christoph Bioorganic and Medicinal Chemistry Letters, 2013 , vol. 23, # 7 p. 2212 - 2216