16564
Results : According to the AUC0 - t comparisons , silexan had no relevant effect on CYP1A2 , 2C9 , 2D6 , and 3A4 activity .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None