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In addition , when an excess of ethanol was used , diacylglycerol ethers completely disappeared after 15 h , giving a final product mainly composed of monoacylglycerol ethers ( 36 . 6 % ) and fatty acid ethyl esters ( 46 . 4 % ) .
 ethanol, diacylglycerol ethers, monoacylglycerol ethers, fatty acid ethyl esters
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ethanol, diacylglycerol ethers, monoacylglycerol ethers, fatty acid ethyl esters