14129
The structure activity relationship ( SAR ) revealed that the position and physicochemical character of the aromatic substituent proved to be critical for the levels of 3 , 4 - dihydroxyphenylacetic acid ( DOPAC ) in the brain of freely moving rats .
 Chemical: 3 , 4 - dihydroxyphenylacetic acid; Chemical: DOPAC
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: 3 , 4 - dihydroxyphenylacetic acid; Chemical: DOPAC