10843
Unambiguous evidence for the engagement of CF ( 3 ) group in N - H . . . F - C hydrogen bond in a low polarity solvent , the first observation of its kind , is reported .
 CF ( 3 ), N - H, F - C, hydrogen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 CF ( 3 ), N - H, F - C, hydrogen