rac-6-[2-(2,2-dimethylpropyl)-2-hydroxy-4-phenylbut-3-ynoylamino]-4-methyl-2,3-benzoxazin-1-one 生成 (R)-6-[2-(2,2-dimethylpropyl)-2-hydroxy-4-phenylbut-3-ynoylamino]-4-methyl-2,3-benzoxazin-1-one 、 (S)-6-[2-(2,2-dimethylpropyl)-2-hydroxy-4-phenylbut-3-ynoylamino]-4-methyl-2,3-benzoxazin-1-one