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A total of 68 chemicals including derivatives of naphthalene , phenanthrene , fluoranthene , pyrene , biphenyl , and flavone were examined for their abilities to interact with human P450s 2A13 and 2A6 .
 Chemical: naphthalene; Chemical: phenanthrene; Chemical: fluoranthene; Chemical: pyrene; Chemical: biphenyl; Chemical: flavone
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: naphthalene; Chemical: phenanthrene; Chemical: fluoranthene; Chemical: pyrene; Chemical: biphenyl; Chemical: flavone