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Sprague - Dawley rats were intraperitoneally given dimethyl n - nitrosamine ( DMN ) ( 10mg / kg ) 3 days per week for 4 weeks .
 Chemical: dimethyl n - nitrosamine; Chemical: DMN
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: dimethyl n - nitrosamine; Chemical: DMN