| 摘要 |
A herbicidal composition which comprises a carrier and, as active ingredient, a compound of the general formula I or a salt thereof: <CHEM> in which A represents an optionally-substituted phenyl group and each of R<1>, R<2>, and R<3> independently represents a hydrogen atom, a cyclopropyl group, or an alkyl, alkenyl, alkynyl, alkoxy, alkenyloxy or alkynyloxy group optionally substituted by one or more of the same or different substituents selected from halogen atoms and alkoxy, alkylthio, amino, alkylamino and dialkylamino groups; the total number of carbon atoms present in each of R<1>, R<2>, or R<3> being not more that 6; or R<1> has one of the meanings given above, and R<2> and R<3> together represent a dimethylene or trimethylene group. Certain of the compounds of formula I and their salts are novel.
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