26946
Recent in vitro data indicate , that commonly employed surfactants as well as endogenous surfactants present in the intestine , although enhancing drug solubility , mostly hamper drug permeation .
 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