1,2-CYCLOBUTANEDICARBONITRILE, (E)- 1,2-Cyclobutanedicarbonitrile, trans- 3211-20-9 AI3-50493 EINECS 221-722-4 NSC 73704 USAF ST-1 trans-1,2-Cyclobutanedicarbonitrile trans-1,2-Dicyanocyclobutane