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Reversed - phase high performance liquid chromatography ( RP - HPLC ) , followed by post - column addition of lithium salts and electrospray ionisation triple - stage mass spectrometry ( ESI - MS ( 3 ) ) of lithiated TAG adducts , is shown to provide a useful method for the positional analysis of triacylglycerols ( TAGs ) in fish oils containing eicosapentaenoic ( EPA , 20 : 5 ) and docosahexaenoic acids ( DHA , 22 : 6 ) .
 lithiated TAG, triacylglycerols, TAGs, eicosapentaenoic, EPA, docosahexaenoic acids, DHA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 lithiated TAG, triacylglycerols, TAGs, eicosapentaenoic, EPA, docosahexaenoic acids, DHA