The present invention relates to the use of 4a, 5a, 8a, 8b-tetrahydro-6H-pyrrolo[3',4':4,5]furo[3,2-b]pyridine-6,8(7H)-dione derivatives of the general formula (I) and salts thereof, ##STR1## in which the radicals R.sup.1 to R.sup.5 have the meaning given in the description, and to novel 4a, 5a, 8a, 8b-tetrahydro-6H-pyrrolo[3',4':4,5]furo[3,2-b]pyridine-6,8(7H)-dione derivatives and processes for their preparation.
本发明涉及使用一般式(I)及其盐的4a, 5a, 8a, 8b-四氢-6H-
吡咯并[3',4':4,5]
呋喃[3,2-b]
吡啶-6,8(7H)-二酮衍
生物,其中基团R^1至R^5的含义如描述中所给出,并涉及新的4a, 5a, 8a, 8b-四氢-6H-
吡咯并[3',4':4,5]
呋喃[3,2-b]
吡啶-6,8(7H)-二酮衍
生物及其制备方法。