for all of the nitrosamines larger than diethylnitrosamine ( except for methylbenzylnitrosamine ) mutagenesis was greatly enhanced ( 3-20 x ) by the lack of uvrb activity , indicating that the dna adducts produced by these nitrosamines can be classified as `` '' bulky adducts '' '' .
C0012200
diethylnitrosamine
C0028197
nitrosamines