6919
Postnatal days ( PND ) 22 - old Sprague - Dawley rats were administered with thiazole - Zn daily by oral gavage at doses 0 , 40 , 100 , 200 mg / kg / day for 20 days .
 Chemical: thiazole; Chemical: Zn
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: thiazole; Chemical: Zn