10770
Hence , to elucidate the cellular mechanisms that can address these divergent reports , we studied intestinal absorption of the dual substrate loperamide in portal vein - cannulated P - gp - competent and P - gp - deficient mice .
 loperamide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 loperamide