1. Department of Chemistry, Bucknell University, Lewisburg, Pennsylvania 17837, United States
2. Process Chemistry, Achaogen, Inc., South San Francisco, California 94080, United States
3. Discovery Chemistry and DMPK, Neuroscience Drug Discovery, H. Lundbeck A/S, 2500 Valby, Denmark
4. Process Chemistry, Seattle Genetics, Bothell, Washington 98021, United States
5. Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States