| 摘要 |
Compounds of the formula: <IMAGE> wherein A is O or S, halo is chloro, bromo or fluoro; X' is -CH2-, O or S; X is hydrogen or halo; R1 and R2 are the same or different radicals selected from hydrogen or lower alkyl; and Z can be a variety of substituents and agronomically acceptable salts, esters and amides as well as other heterocyclic benzenes are disclosed as selective herbicides.
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