6- 124588-- 12344588--6-3'4':4532--87- 6-Substituted 124a5a8a8b-hexahydro- and 12344a5a8a8b-octahydro-6H-pyrrolo3'4':45furo32-bpyrid-87H-one derivatives and their use in combatting endoparasites

摘要

The present invention relates to 6-substituted 1,2,4a, 5a, 8a, 8b-hexahydro- or 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 salts, their preparation and their use for controlling in vivo parasites:;[Formula I];In the above formula,;The radicals R ¹ , R ² , R ³ , R ⁴ , B and A are each as defined in the detailed description.