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Chemical structures of carcinogenic N-nitrosamines to which humans are commonly exposed. NDMA, N-nitrosodimethylamine; NMEA, N-nitrosomethylethylamine; NSAR, N-nitrososarcosine; NDEA, N-nitrosodiethylamine; NDPA, N-nitrosodi-n-propylamine; NDELA, N-nitrosodiethanolamine; NDBA, N-nitrosodi-n-butylamine; NPYR, N-nitrosopyrrolidine; NPIP, N-nitrosopiperidine; NMOR, N-nitrosomorpholine.
