11866
As the coumarins are structurally related to coumestans by virtue of their common A - and B - rings , we postulated them to also exhibit similar binding interaction with NS5B and inhibit its polymerase function .
 Chemical: coumarins; Chemical: coumestans
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: coumarins; Chemical: coumestans