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18 65 87 93 100 0.3'* Cunen X 10_,! ' M for 50% inhibition of MAO activity of scintillation fluid and the radioactivity was measured. A blank contg boiled enzyme was carried through the entire procedure. The reported results are the averages of replicates and the average variation in the same experiment was ± ó %. The 1.0 was derived from a graph of the log conen/per cent inhibition. Chemistry.I.-The N-nitrosoamines were prepd by the method of Hartman and Roll.13 HC1 was replaced by AcOH, the reaction was carried out under N2 (HONO is lost by reaction with O»), and the mixt was heated to 60-70°after the addn of the NaN()2 soln. The compds were distd and anald, but can be used crude in the redns. The nmr spectra show split Me and CH2 peaks.

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