A compound of the formula: ##STR1## wherein R.sup.1 is a C.sub.1 -C.sub.6 alkyl group, a C.sub.3 -C.sub.7 alkenyl group, a C.sub.3 -C.sub.7 alkynyl group, a halo(C.sub.1 -C.sub.5)alkyl group, a halo(C.sub.3 -C.sub.4) alkenyl group, a halo(C.sub.3 -C.sub.4)alkynyl group, a C.sub.1 -C.sub.4 alkoxy(C.sub.1 -C.sub.2)alkyl group, a C.sub.1 -C.sub.2 alkylthio(C.sub.1 -C.sub.2)alkyl group and R.sup.2 is a hydrogen atom or a methyl group, which is useful as a herbicide.
一种化合物的分子式:##STR1## 其中R.sup.1 是C.sub.1-C.sub.6烷基、C.sub.3-C.sub.7烯基、C.sub.3-C.sub.7炔基、卤代(C.sub.1-C.sub.5)烷基、卤代(C.sub.3-C.sub.4)烯基、卤代(C.sub.3-C.sub.4)炔基、C.sub.1-C.sub.4烷氧基(C.sub.1-C.sub.2)烷基、C.sub.1-C.sub.2烷
硫基(C.sub.1-C.sub.2)烷基,R.sup.2 是氢原子或甲基基团,其作为
除草剂有用。