4816
The four most active compounds showed an IC 5 0 of around 60 nM and a very good selectivity toward 17 beta - HSD1 , 17 beta - HSD4 , 17 beta - HSD5 , 11 beta - HSD1 , 11 beta - HSD2 and the estrogen receptors alpha and beta .
 Chemical: estrogen
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: estrogen