23399
In this study , the in vitro inhibitory effects of gypenosides on the major human CYP enzymes ( CYP1A2 , CYP2B6 , CYP2C8 , CYP2C9 , CYP2C19 , CYP2D6 , and CYP3A4 ) activities in human liver microsomes were examined using liquid chromatography - tandem mass spectrometry .
 Chemical: gypenosides
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: gypenosides