6-Substituted 1,2,4a, 5a, 8a, 8b hexahydro- and 1,2,3,4,4a, 5a, 8a, 8b-octahydro-6H-pyrrolo 3 ', 4': 4,5 furo 3,2-b pyrid-8 (7H) -one derivatives and their use for controlling internal parasites

摘要

The present invention relates to 6-substituted 1,2,4a,5a,8a,8b-hexahydro- and 1,2,3,4,4a,5a,8a,8b-octahydro-6H-pyrrolo[3',4':4,5]furo[3,2-b]pyrid-8(7H)-one derivatives of the general formula (I) and their saltsin whichthe radicals R1, R2, R3, R4, B and A are each as defined in the description, to processes for their preparation and to their use for controlling endoparasites.