1 74B (4ar,6r,8as)-8a-(2,4-difluoro-5-{[(2,2,2-trifluoroethyl)amino]methyl}phenyl)-6-(fluoromethyl)-4,4a,5,6,8,8a-hexahydropyrano[3,4-D][1,3]thiazin-2-amine 1.000 2 3VP (4ar,6r,8as)-8a-(2,4-difluorophenyl)-6-(fluoromethyl)-4,4a,5,6,8,8a-hexahydropyrano[3,4-D][1,3]thiazin-2-amine 0.750