21690
The results show that reversal of the Delta V sign caused by fluorination of the polar heads originates from the upward - oriented CF3 terminals of the FEE heads , whose negative normal dipole moment component determines the negative dipole potential of the FEE monolayer .
 Chemical: CF3; Chemical: FEE; Chemical: FEE
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: CF3; Chemical: FEE; Chemical: FEE