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Butein protects human dental pulp cells from hydrogen peroxide - induced oxidative toxicity via Nrf2 pathway - dependent heme oxygenase - 1 expressions .
 Chemical: Butein; Chemical: hydrogen peroxide
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