Definition: A biogenic polyamine formed from spermidine. It is found in a wide variety of organisms and tissues and is an essential growth factor in some bacteria. It is found as a polycation at all pH values. Spermine is associated with nucleic acids, particularly in viruses, and is thought to stabilize the helical structure.
N(1),N(11)-diethylnorspermine [ 1,11-bis(ethylamino)-4,8-diazaundecane,BE 3-3-3,BE 333,BE-3-3-3,BE-333,BENSM,BENSpm,BESPM,DE-333,DENSPM,N(1),N(11)-bis(ethyl)norspermine,N1,N11-bis(ethyl)norspermine,bis(ethyl)norspermine ] structure given in first source