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The rate constant ( kobs ) of formation of decamethylferrocenium ion ( Fc * ( + ) ) in the catalytic four - electron reduction of O2 by Fc * in the presence of a large excess CF3COOH and O2 obeyed first - order kinetics .
 decamethylferrocenium, 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:
 decamethylferrocenium, O2, CF3COOH, O2