the carcinogenic activities of n-nitrosodiethylamine ( ndea ) , n-nitrosopyrrolidine ( npyr ) and n-nitrosodiethanolamine ( ndela ) and of the combination of the three nitrosamines was determined in sprague-dawley rats at three logarithmically spaced exposure levels .
C0027253
n-nitrosopyrrolidine
C0028197
nitrosamines