27640-20-6 4-04-00-03393 (Beilstein Handbook Reference) BRN 1802529 N-Carbamyl-N-nitrosotetramethylenediamine NSC 157950 Urea, 1,1'-dinitroso-1,1'-tetramethylenedi- Urea, 1,1'-tetramethylenebis(1-nitroso)- Urea, 1,1'-tetramethylenebis(1-nitroso- Urea, N,N''-1,4-butanediylbis(N-nitroso- (9CI)