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On the other hand , a decrease in the concentrations of free MDA in brain structures was observed after acute administration of n - hexane , 1 , 2 , 4 - trimethylcyclohexane , toluene and n - butylbenzene .
 Chemical: MDA; Chemical: n - hexane; Chemical: 1 , 2 , 4 - trimethylcyclohexane; Chemical: toluene; Chemical: n - butylbenzene
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: MDA; Chemical: n - hexane; Chemical: 1 , 2 , 4 - trimethylcyclohexane; Chemical: toluene; Chemical: n - butylbenzene