| 摘要 |
The invention discloses compounds of the formula <IMAGE> wherein R1 is selected from the group consisting of alkyl of up to 4 carbon atoms, alkenyl, chloroalkyl, trifluoromethyl, alkoxy, alkylthio, alkylsulfonyl and alkylsulfinyl; and R2 is selected from the group consisting of alkyl, alkenyl, haloalkyl and <IMAGE> wherein R3 and R4 are each selected from the group consisting of hydrogen and alkyl.
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