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The results of our study suggest that salvianolic acid A possessing antioxidant activity has a significant protective effect against isoproterenol - induced myocardial infarction .
 salvianolic acid A, isoproterenol, myocardial infarction
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 salvianolic acid A, isoproterenol, myocardial infarction