1. Department of Pharmaceutical Chemistry, University of California San Francisco, 1700 4th St., Byers Hall, BH‐501, Box 2550, San Francisco, CA 94158 (USA)
2. Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, 600 16th St., Genentech Hall, S472E, Box 2240, San Francisco, CA 94158 (USA)