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The kobs value was proportional to the concentration of catalyst 1 or 2 , whereas the kobs value remained constant irrespective of the concentration of CF3COOH or O2 .
 CF3COOH, O2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 CF3COOH, O2