“…In addition, the 4-oxoalkan-1,1,2,2-tetracarbonitriles 6-imino-2,7-dioxabicyclo[3, 2, 1]octan-4,4,5-tricarbonitriles, 9-oxo-1,2,3,4b,5,6,8a,9-octahydropyrido[3 1 ,4 1 :3, 4]pyrrolo[1, 2-a]- [1,3,5]triazin-4b,8a-dicarbonitriles, 1-oxo-3a,4,5,7a-tetrahydro-1H-pyrrolo[3, 4-c]pyridin-3a,7a-dicarbonitriles, and 1,2,3,4-tetrahydropyridin-3,3,4,4-tetracarbonitriles were tested for antitumor activity [12]. The most active among them was 2-(4-bromophenyl)-5,6-tetramethylen-1,2,3,4-tetrahydropyridin-3,3,4,4-tetr acarbonitrile.…”