23080
In contrast , mice dosed with the positive control substance , 1 - methyl - 4 - phenyl - 1 , 2 , 3 , 6 - tetrahydropyridine ( MPTP ; 10mg / kg / dose x 4 doses , 2h apart ) , displayed significantly reduced DA and DOPAC concentrations and increased DA turnover in the striatum 7 days after dosing .
 1 - methyl - 4 - phenyl - 1 , 2 , 3 , 6 - tetrahydropyridine, MPTP, DOPAC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 1 - methyl - 4 - phenyl - 1 , 2 , 3 , 6 - tetrahydropyridine, MPTP, DOPAC