Isovaleric acid ester derivatives and the optical isomers thereof expressed by the general formula I: ##STR1## wherein, R.sub.1 represents hydrogen, methyl group or chlorine atom, and R.sub.2 represents hydrogen or cyano group.
一般公式I所表示的
异戊酸酯衍
生物及其光学异构体如下: ##STR1## 其中,R.sub.1代表氢、甲基或
氯原子,R.sub.2代表氢或
氰基。