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UVA Radiation Induced Ultrafast Electron Transfer from a Food Carcinogen Benzo [ a ] pyrene to Organic Molecules , Biological Macromolecules , and Inorganic Nano Structures .
 Benzo [ a ] pyrene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Benzo [ a ] pyrene