21398
The purpose of this study was to investigate the anti - fibrotic effects of the aqueous extract of the Platycodi Radix root ( Changkil : CK ) on dimethylnitrosamine ( DMN ) - induced liver fibrosis in rats .
 Chemical: dimethylnitrosamine; 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: dimethylnitrosamine; Chemical: DMN