11508
Under treatment over a 25 - day culture period , the maximal biomass levels reached 1 . 92 - and 1 . 74 - fold and the total flavonoid contents are 1 . 45 - and 1 . 49 - fold , than that of control , respectively .
 flavonoid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 flavonoid