| 摘要 |
For controlling parasitic protozoa and fish parasites, the novel :substituted hexahydro-1,2,4-triazinediones of the formula <IMAGE> in which R1 represents a heteroaromatic radical which is bonded via carbon and is optionally substituted, X represents O, S, SO, SO2 or -CR5(CN)-, R2 represents one or more identical or different radicals from the group consisting of hydrogen, halogen, nitro, alkyl, alkoxy, halogenoalkyl, halogenoalkoxy, alkylthio and halogenoalkylthio, R3 and R4, independently of one another, represent hydrogen, optionally substituted alkyl, alkenyl, alkinyl or aralkyl, and R5 represents hydrogen or alkyl, excepting compounds in which X represents -CR5(CN)- and R1 represents thienyl.
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