short-chain nitrosamine congeners were selected for these studies on the basis of two criteria : ( 1 ) congeners with symmetrical aliphatic chain length [ n-nitrosodimethylamine ( dmn ) , n-nitrosodiethylamine ( den ) , n-nitrosodipropylamine ( dpn ) , n-nitrosodibutylamine ( dbn ) ] and ( 2 ) congeners possessing an n-methyl group [ n-nitrosomethylethylamine ( men ) , n-nitrosomethylpropylamine ( mpn ) , and n-nitrosomethylbutylamine ( mbn ) ] .
C0028197
nitrosamine
C0012431
dmn