18092
( 1 ) H NMR spectroscopy was applied to investigate the changes of cerebral metabolites in brain hippocampus , nucleus accumbens ( NAC ) and prefrontal cortex ( PFC ) of the rats subjected to subcutaneous twice - daily injections of 2 . 5mg / kg methamphetamine ( MAP ) for 7 days .
 Chemical: ( 1 ) H; Chemical: methamphetamine; Chemical: MAP
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: ( 1 ) H; Chemical: methamphetamine; Chemical: MAP