4-Methylnitrosamino-1,3-pyridyl-1-butanone

**Semantic type:** Hazardous or Poisonous Substance

**Definition:** A yellowish crystalline solid nitrosamine that naturally occurs in tobacco products by oxidation and nitrosation of nicotine during the making and smoking of tobacco. 4-Methylnitrosamino-1,3-pyridyl-1-butanone is only used as a research chemical to induce tumorigenesis. This substance is reasonably anticipated to be a human carcinogen. (NCI05)

**Synonyms:** - 4-(Methylnitrosamino)-1-(3-Pyridyl)-1-Butanone - 4-N-Nitrosomethylamino-1-3-Pyridyl-1-Butanone - NNK - Nicotine-Derived Nitrosamine Ketone