24923
Vibrational sum - frequency generation activity of a 2 , 4 - dinitrophenyl phospholipid hybrid bilayer : retrieving orientational parameters from a DFT analysis of experimental data .
 2 , 4 - dinitrophenyl
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 2 , 4 - dinitrophenyl