5097
The 2 , 2 ' , 4 , 4 ' - tetrabromodiphenyl ether hydroxylated metabolites 5 - OH - BDE - 47 and 6 - OH - BDE - 47 stimulate estradiol secretion in the ovary by activating aromatase expression .
 Chemical: 2 , 2 ' , 4 , 4 ' - tetrabromodiphenyl ether; Chemical: 5 - OH - BDE - 47; Chemical: 6 - OH - BDE - 47; Chemical: estradiol
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: 2 , 2 ' , 4 , 4 ' - tetrabromodiphenyl ether; Chemical: 5 - OH - BDE - 47; Chemical: 6 - OH - BDE - 47; Chemical: estradiol