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The liver levels of beta - oxidation metabolites of VPA were decreased by day 14 , while the levels of 4 - ene - VPA and ( E ) - 2 , 4 - diene - VPA were not elevated throughout the study .
 Chemical: VPA; Chemical: 4 - ene - VPA; Chemical: 2 , 4 - diene - VPA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: VPA; Chemical: 4 - ene - VPA; Chemical: 2 , 4 - diene - VPA