971
In vitro investigation of the inhibition of 20 ( S ) - protopanaxatriol ( ppt ) towards UGT1A1 and UGT2B7 was carried out .
 20 ( S ) - protopanaxatriol, ppt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 20 ( S ) - protopanaxatriol, ppt