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Pentoxifylline ( Trental ) does not inhibit dipyridamole - induced coronary hyperemia : implications for dipyridamole - thallium - 201 myocardial imaging .
 Pentoxifylline, Trental, dipyridamole, hyperemia, dipyridamole, thallium
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Pentoxifylline, Trental, dipyridamole, hyperemia, dipyridamole, thallium