the tumorigenic activities and dna methylating abilities in f344 rats of the tobacco specific nitrosamine 4- ( methylnitrosamino ) -1- ( 3-pyridyl ) -1-butanone ( nnk ) and the structurally related nitrosamine n-nitrosodimethylamine ( ndma ) were compared .
C0028197
nitrosamine
C0012431
nitrosodimethylamine