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Specific dopamine - 1 , ( DA1 ) and dopamine - 2 ( DA2 ) receptor agonists are now under clinical investigation .
 Chemical: dopamine; Chemical: DA1; Chemical: dopamine; Chemical: DA2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: dopamine; Chemical: DA1; Chemical: dopamine; Chemical: DA2