| 摘要 |
Use of substituted 2-mercaptonicotinic acid derivatives for combating endoparasites, new substituted 2-mercaptonicotinic acid derivatives and processes for their preparation The present invention relates to the use of compounds of the general formula I I in which R1 represents C1-C8-alkyl, aralkyl, aryl or heteroaryl radicals which are optionally substituted by halogen, cyano, nitro, amino, alkylamino, aminoacyl, alkyl, aralkyl, halogenoalkyl, alkoxy, aryloxy, halogenoalkoxy, alkylthio, arylthio, alkylsulphinyl, arylsulphinyl, arylsulphonyl, halogenoalkylthio, haloganoalkylsulphinyl, halogenoalkylsulphonyl or carbonylaryl, X represents O, or / N-R3, R2 represents C1-5-alkyl, aralkyl, alkenyl or alkinyl, R3 represents H or alkyl or R1 and R3, together with the adjacent N atom, represent a 5 or 6-membered heterocycle which can contain O or N as additional heteroatoms and is optionally substituted by C1-4-alkyl, Le A 27 948 R4 represents hydrogen, halogen, alkyl, halogenoalkyl, cyano, nitro, amino, aminoacyl, phenyl, alkoxy, aryloxy, thioalkyl and arylthio which are optionally substituted, for combating endoparasites in medicine and veterinary medicine. Le A 27 9413
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