4,9-Dihydro-4,9-dioxo-1H-cycloheptabpyridine derivatives

摘要

Aldose reductase inhibitors of the formula ##STR1## in which R. sup.1 is COOH and R.sup.2 is hydrogen, 8-halo or 6-hydroxy, or R.sup.1 is CON(R. sup.3)-CH.sub.2 COOH wherein R.sup.3 is lower alkyl and R.sup.2 is hydrogen or 8-halo are useful for treating diabetic complications.