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Structures of tobacco specific nitrosamines and tobacco alkaloid precursors. NNA, 4-(methylnitrosamino)-4-(3-pyridyl)butanal; NAB, N′-nitrosoanabasine; NAT, N′-nitrosoanatabine; NNAL, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol; NNAC, 4-(methylnitrosamino)-4-(3-pyridyl)butanoic acid. Hecht, 1998 [32].
