Human BACE-1 in complex with 6-(ethylamino)-N-((1S,2R)-2-hydroxy-3-(((3-(methyloxy)phenyl)methyl)amino)-1-(phenylmethyl)propyl)-1-methyl-1, 3,4,5-tetrahydro-2,1-benzothiazepine-8-carboxamide 2,2-dioxide