| 摘要 |
Herbicidally active compounds of the formula I:- <CHEM> wherein R, R1 and R2 represent hydrogen or alkyl, R3, R4, R5 and R6 represent hydrogen, hydroxyl or oxo (subject to certain constraints), and R7 represents alkyl, alkoxy or cycloalkyl; the preparation of such compounds and their use as herbicides and in herbicidal compositions. |
