1. Laboratory of Organic Chemistry, Wageningen University, Dreijenplein 8,6703 HB Wageningen, The Netherlands; Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV-1006, Latvia; and Bijvoet Center for Biomolecular Research, Crystal and Structural Chemistry, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands