22675
A total of 36 rats were randomly divided into six groups ( n = 6 per group ) as control , oestradiol ( E2 , 100 mu g / kg ) , PCB 180 , Aroclor 1221 , endosulfan and mirex at 10 mg / kg dosage .
 oestradiol, PCB 180, Aroclor 1221, endosulfan, mirex
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 oestradiol, PCB 180, Aroclor 1221, endosulfan, mirex