7219
We found that sarin concentrates at the interface between the hydrophilic and hydrophobic subphases of hydrated Nafion acting as a surfactant .
 Chemical: sarin; Chemical: hydrated Nafion
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: sarin; Chemical: hydrated Nafion