1. Department of Chemistry; Rice University; 6100 Main Street Houston TX 77005 USA
2. Laboratory of Chemical Biology of Natural Products & Designed Molecules; National Centre of Scientific Research (NCSR) “Demokritos”; Agia Paraskevi Athens 15310 Greece
3. Stemcentrx, Inc.; 450 East Jamie Court San Francisco CA 94080 USA
4. Pfizer Worldwide Research & Development; 610 Main Street Cambridge MA 02139 USA