Compounds which are useful as selective herbicides have the general structural formula ##STR1## in which R.sup.1 and R.sup.2 are selected from hydrogen, and lower alkyl, alkenyl, alkylene and alkoxy structures and together possess a total of 1 to 6 carbon atoms when R.sup.3 is ethyl, propyl, isopropyl, cyclopropyl, methoxy or tert-butyl.
具有选择性
除草剂作用的化合物具有以下一般结构式:##STR1## 其中当R.sup.3为乙基、丙基、异丙基、环丙基、甲氧基或叔丁基时,R.sup.1和R.sup.2从氢、低级烷基、烯基、烷基和烷氧结构中选择,并共同具有1到6个碳原子。