1. MTA-ELTE Research Group of Peptide Chemistry, Hungarian Academy of Sciences; Eötvös Loránd University; PO Box 32 H-1518 Budapest 112 Hungary
2. Laboratory for Chiroptical Structure Analysis, Institute of Chemistry; Eötvös Loránd University; Budapest Hungary
3. Department of Dermatology, Venereology and Dermato-Oncology; Semmelweis University; Budapest Hungary
4. Department of Organic Chemistry, Institute of Chemistry; Eötvös Loránd University; Budapest Hungary