1. Department
of Medicinal Chemistry and ‡Department of Molecular Structure, Amgen Inc., 360 Binney Street, Cambridge, Massachusetts
02142, United States
2. Department
of Neuroscience, ∥Department of Pharmacokinetics and Drug Metabolism, ⊥Department of HTS and Molecular
Pharmacology, and #Department of Pharmaceutics, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United
States