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However , based on the results for different antipsychotics ( haloperidol , olanzapine , quetiapine and risperidone ) we found evidence that the affinity to the dopamine ( DA ) D ( 2 ) - receptor may influence BOLD - signal .
 haloperidol, olanzapine, quetiapine, risperidone, dopamine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 haloperidol, olanzapine, quetiapine, risperidone, dopamine