2651
These results draw attention to the inefficiency of catechin to prevent actin oxidation , in contrast to the extremely high efficiency of catechin in inhibiting oxidation of lipids and other proteins .
 catechin, catechin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 catechin, catechin