1. Institute of Pharmacology of Natural Products & Clinical Pharmacology, Ulm University, Helmholtzstr. 20, 89081 Ulm, Germany
2. Institute of Physiological Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
3. Department of Medicinal Chemistry, School of Pharmacy, Fourth Military Medical University, 710032 Xi’an, P. R. China