Compounds of the formula ##STR1## in which X denotes O or S; R and R.sup.1 denote H, halogen, alkyl, alkoxy, CN, NO.sub.2 or CF.sub.3 ; R.sup.2 denotes H or alkyl; Y denotes an optionally substituted alkylene or phenylene group and Z denotes a carboxyl, carboxylate, carboxylic acid ester, carboxamide, nitrile or thioamide group, are suitable for reducing the phytotoxicity of herbicides in useful plants.
式子为##STR1## 的化合物,其中X代表O或S;R和R.sup.1代表氢、卤素、烷基、烷氧基、CN、NO.sub.2或CF.sub.3;R.sup.2代表氢或烷基;Y代表可选择取代的烷基或苯基基团,而Z代表羧基、
羧酸盐、
羧酸酯、羧酰胺、腈或
硫脲基团,适用于降低杂草
除草剂对有用植物的毒性。