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Here , we found that butein possesses cytoprotective effects on hydrogen peroxide ( H2O2 ) - induced dental cell death .
 Chemical: butein; Chemical: hydrogen peroxide; 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: butein; Chemical: hydrogen peroxide; Chemical: H2O2