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3 ' , 5 ' - Di - C - beta - glucopyranosylphloretin , naringin , hesperidin , nobiletin , and tangeretin are the five major flavonoids found in hot water extract with the levels of 6888 +/- 522 , 2333 +/- 157 , 1350 +/- 94 , 165 +/- 13 , and 8 +/- 4 mg / 100 g dry basis , respectively .
 3 ' , 5 ' - Di - C - beta - glucopyranosylphloretin, naringin, hesperidin, nobiletin, tangeretin, flavonoids
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
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Answer:
 3 ' , 5 ' - Di - C - beta - glucopyranosylphloretin, naringin, hesperidin, nobiletin, tangeretin, flavonoids