Affiliation: | 1. Departments of Medicinal Chemistry and Molecular Structure, Amgen Inc., One Amgen Center Drive, Thousand Oaks, CA 91320 (USA), Fax: (+1)?805‐480‐1337;2. Chemical Synthesis Laboratory@Biopolis, Institute of Chemical Engineering Sciences (ICES), Agency for Science, Technology, and Research (A*STAR), 11 Biopolis Way, The Helios Block, no. 03‐08, Singapore 138667 (Singapore);3. Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037 (USA);4. Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093 (USA) |