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()- N -nitroso-nornicotine (NNN), ()-NNN-d 4 (2,4,5,6-tetradeutero-(5-(1-nitroso-2-pyrrolidinyl))-pyridine), 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), NNK-d 4 (4-(methylnitrosamino)-1-(2,4,5,6-tetradeutero-3-pyridyl)-1-butanone, ()-4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL) and ()-NNAL-d 3 (4-(trideuteromethyl-nitrosamino)-1-(3-pyridyl)-1-butanol were purchased from Toronto Research Chemicals (Ontario, Canada)
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