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Using 0 . 5 mu M Py3MeO - TBPo , flow cytometry studies demonstrated an increase of intracellular drug levels related to the incubation time , reaching a maximum at 18 h .
 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