26853
However , the precise mechanism by which quercetin counteracts CYP2E1 - mediated ethanol hepatotoxicity through HO - 1 system is still remained unclear .
 Chemical: quercetin; Chemical: ethanol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: quercetin; Chemical: ethanol