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One such nontoxic natural agent is the flavonoid silibinin , derived from the milk thistle plant ( Silybum marianum ) , which has ancient medicinal usage and potent antioxidant activity .
 Chemical: silibinin
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