28549
Eleven compounds were identified as estrogen receptor modulators from an in - house natural product database ( NPD ) by structure - based virtual screening for ER alpha and ER 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