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We also found that amphetamine abstinence increased levels of 4 - hydroxynonenal - protein adducts and 8 - hydroxyguanosine in rat medial frontal cortex and in CA3 and dentate gyrus regions of the hippocampus .
 Chemical: amphetamine; Chemical: 4 - hydroxynonenal; Chemical: 8 - hydroxyguanosine
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: amphetamine; Chemical: 4 - hydroxynonenal; Chemical: 8 - hydroxyguanosine