to test the hypothesis that n-nitrosodimethylamine ( ndma ) and possibly other nitrosamines are synthesized naturally in the gastrointestinal tract , the urinary excretion of nitrosamines has been measured in people whose first pass clearance and metabolism of nitrosamines had been inhibited by administration of ethanol .
C0012431
n-nitrosodimethylamine
C0028197
nitrosamines