tert-butyl[(4aR,6R,8aS)-6-(fluoromethyl)-8a-(2-fluorophenyl)-4,4a,5,6,8,8a-hexahydropyrano[3,4-d][1,3]thiazin-2-yl]carbamate 、 (4aR,6R,8aS)-8a-(2-fluorophenyl)-6-[(propan-2-yloxy)methyl]-4,4a,5,6,8,8a-hexahydropyrano[3,4-d][1,3]thiazin-2-amine trifluoroacetate salt 生成 (4aR,6R,8aS)-6-(fluoromethyl)-8a-(2-fluorophenyl)-4,4a,5,6,8,8a-hexahydropyrano[3,4-d][1,3]thiazin-2-amine