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In contrast , Py3MeO - TBPo combined with red - light irradiation induced concentration - and fluence - dependent HeLa cells inactivation .
 Py3MeO - TBPo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Py3MeO - TBPo