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In this study , silibinin , a plant flavonolignan extracted from milk thistle with potent antioxidant activity , was evaluated for its effects in ( a ) preventing hydrogen peroxide ( H2O2 ) - induced cellular damage and ( b ) blocking the phenylephrine - induced hypertrophic response .
 Chemical: silibinin; Chemical: flavonolignan; Chemical: hydrogen peroxide; Chemical: H2O2; Chemical: phenylephrine
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: flavonolignan; Chemical: hydrogen peroxide; Chemical: H2O2; Chemical: phenylephrine