28885
Compared to the stilbene analogs such as tamoxifen and raloxifene , the three cyclopropane analogs showed lower binding affinity for estrogen receptor , but higher subtype selectivity for ER alpha .
 stilbene, tamoxifen, raloxifene, cyclopropane, estrogen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 stilbene, tamoxifen, raloxifene, cyclopropane, estrogen