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Neither dose of pentoxifylline significantly decreased the dipyridamole - induced hyperemia , while peak coronary blood flow was significantly lower after theophylline ( p less than 0 . 01 ) .
 pentoxifylline, dipyridamole, hyperemia, theophylline
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 pentoxifylline, dipyridamole, hyperemia, theophylline