9112
This study assesses hydroxyl radical ( OH ) generation and measures malondialdehyde ( MDA ) levels in the cerebral tissue of rats exposed to six solvents ( n - hexane , n - octane , toluene , n - butylbenzene , cyclohexane and 1 , 2 , 4 - trimethylcyclohexane ) .
 Chemical: hydroxyl; Chemical: OH; Chemical: malondialdehyde; Chemical: MDA; Chemical: n - hexane; Chemical: n - octane; Chemical: toluene; Chemical: n - butylbenzene; Chemical: cyclohexane; Chemical: 1 , 2 , 4 - trimethylcyclohexane
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: hydroxyl; Chemical: OH; Chemical: malondialdehyde; Chemical: MDA; Chemical: n - hexane; Chemical: n - octane; Chemical: toluene; Chemical: n - butylbenzene; Chemical: cyclohexane; Chemical: 1 , 2 , 4 - trimethylcyclohexane