| 摘要 |
23189-7227 A method of combating parasitic protozoa which comprises applying thereto an amount effective therefor of a 1,2,4 triazinedione of the formula I in which R1 represents optionally substituted pyridyl, pyra zinyl or pyrimidinyl, X represents O, S, SO, SO2 or -CR4(CN)-, R2 represents hydrogen, ona or more, identical or different radicals of the group comprising hydrogen, halogen, nitro, alkyl, alkoxy, alkylthio, halogenoalkyl, halogenoalkoxy, alkylthio and halogenoalkylthio, and R3 represents hydrogen, optionally substituted alkyl, alkenyl, alkinyl or aralkyl, Le A 27 175
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