74038-26-9 NSC 222479 Phosphine, p,p'-tetramethylenebis(bis(2-cyanoethyl)- Propanenitrile, 3,3',3'',3'''-(1,4-butanediyldiphosphinidyne)tetrakis- (9CI) Tetramethylenebis(di(2-cyanoethyl)phosphine)