10738
First , B6C3F1 mice were administered diethylnitrosamine ( DEN ; single ip injection of 1mg / kg at 14 days of age ) .
 diethylnitrosamine, DEN
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 diethylnitrosamine, DEN