3292
Taken together , these findings indicate that the inhibition of melanogenesis by artemisinic acid occurs through reduced expression of the HMG CoA reductase gene , which is mediated by C / EBP alpha inhibition and suggest that artemisinic acid may be useful as a hyperpigmentation inhibitor .
 artemisinic acid, HMG CoA, artemisinic acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 artemisinic acid, HMG CoA, artemisinic acid