4,4'-Sulfonyldibenzonitrile 4,4'-Sulphonylbis(benzonitrile) 6461-99-0 BENZONITRILE, 4,4'-SULFONYLDI- Benzonitrile, 4,4'-sulfonylbis- (9CI) EINECS 229-277-8 NSC 91569 Sulfone, bis(p-cyanophenyl) p-Cyanophenyl sulfone