7040
In the sub - chronic toxicity study , the extract was administered orally at doses of 250 , 500 and 1000 mg / kg / day for 28 days to male Wistar rats .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None