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Pyranoflavones : A Group of Small - Molecule Probes for Exploring the Active Site Cavities of Cytochrome P450 Enzymes 1A1 , 1A2 , and 1B1 .
 Chemical: Pyranoflavones
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: Pyranoflavones