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The combined treatment of resveratrol and clofarabine produced a synergistic antiproliferative effect in MSTO - 211H cells , but not in MeT - 5A cells .
 resveratrol, clofarabine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 resveratrol, clofarabine