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Our retrospective review showed 3 other children with high PHB concentrations where primidone was also detected when PHB levels were over 130 mu mol / L .
 Chemical: PHB; Chemical: primidone; Chemical: PHB
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: PHB; Chemical: primidone; Chemical: PHB