| 摘要 |
Herbicidal compounds of the formula: <IMAGE> (I) where R1 is hydrogen, methyl or ethyl; R2 is alkyl of 1-4 carbon atoms, methoxy or cyanomethyl; and p1 R1 and R2 together can be -(CH2)4-, provided that when R2 is alkyl of 3 or 4 carbon atoms, methoxy or cyanomethyl, R1 cannot be ethyl.
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