1. Institute of Bioorganic Chemistry, Polish Academy of Science, Noskowskiego 12/14, 61-704 Poznań, Poland; Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-708 Poznań, Poland; and Department of Pharmacognosy, Karol Marcinkowski University of Medical Science, Sieroca 10, 61-771 Poznań, Poland