The N-glycosides of indolo[2,3-a]furano[3,4-c]carbazole-5,7-dione and
indolo[2,3-a]pyrrolo[3,4-c]carbazole-5,7-dione containing an acyclic c
arbohydrate fragment or a residue of beta-D-ribo-, beta-D-xylo-, alpha
-L-arabino-, beta-D-galactopyranose, or beta-D-lactose were synthesize
d, and their influence on the in vitro DNA biosynthesis in the human o
vary carcinoma cells CaOv was studied.