26955
The oxygen reduction reaction ( ORR ) has been studied at Pt surfaces in the protic ionic liquid diethylmethylammonium trifluoromethanesulfonate .
 oxygen, diethylmethylammonium trifluoromethanesulfonate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 oxygen, diethylmethylammonium trifluoromethanesulfonate