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Pretreatment of H9c2 cells with silibinin resulted in better protection of H9c2 cells under conditions of H2O2 - induced cellular stress compared to untreated cells as indicated by cell viability and DNA fragmentation assays .
 Chemical: silibinin; Chemical: H2O2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: silibinin; Chemical: H2O2