4JPC:
reference: Spirocyclic ss-Site Amyloid Precursor Protein Cleaving Enzyme 1 (BACE1) Inhibitors: From Hit to Lowering of Cerebrospinal Fluid (CSF) Amyloid Beta in a Higher Species., Hunt KW, Cook AW, Watts RJ, Clark CT, Vigers G, Smith D, Metcalf AT, Gunawardana IW, Burkard M, Cox AA, Geck-Do M, Dutcher D, Thomas AA, Rana S, Kallan NC, Delisle RK, Rizzi JP, Regal K, Sammond D, Groneberg R, Siu M, Purkey H, Lyssikatos JP, Marlow A, Liu X, Tang TP, J Med Chem. 2013 Mar 28. PMID: 23537249

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