[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][C][N][Branch1][Ring2][C][C][C][N][=O]"}, {"from": "gpt", "value": "The molecule is a chemical produced by industry in small amounts for research. Small amounts of n-nitrosodi-n-propylamine are also produced as a side reaction during some manufacturing processes, as a contaminant in some weed killers, and during the manufacture of some rubber products. It is one ingredient of cigarette. (L216) "}]