1. Laboratory of Tumor and Developmental BiologyUniversity of Liège, Tour de Pathologie (B23)Sart‐TilmanB‐4000LiègeBelgium
2. Syntarga B. V.6525EDNijmegenThe Netherlands
3. Department of Organic ChemistryNSR‐Center for Molecular Structure, Design and Synthesis, University of NijmegenNijmegenThe Netherlands