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Flavone has been previously identified as a tankyrase inhibitor , and to further elucidate whether tankyrases would be inhibited by other flavonoids , we performed a systematic screening of tankyrase 2 inhibitory activity using 500 natural and naturally derived flavonoids covering nine different flavonoid classes .
 Chemical: Flavone; Chemical: flavonoids; Chemical: flavonoids; Chemical: flavonoid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Flavone; Chemical: flavonoids; Chemical: flavonoids; Chemical: flavonoid