A compound of Formula (4), wherein each X is independently fluorine or chlorine; n is 1 or 2; R
1
is C
3
-C
8
alkyl, phenyl or benzyl; and R
2
is C
1
-C
6
alkyl; and its production and use.
公式(4)的化合物,其中每个X独立地为
氟或
氯;n为1或2;R1为C3-C8烷基,苯基或苄基;R2为C1-C6烷基;以及其制备和使用。