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Using the conditioned place preference ( CPP ) paradigm , we investigated the motivational effects of l - dopa , dopamine receptor agonists ( DRAs ) , and cocaine in rat with a bilateral 6 - OHDA lesion of the nigrostriatal dopaminergic pathway .
 Chemical: l - dopa; Chemical: dopamine; Chemical: cocaine; Chemical: 6 - OHDA
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: l - dopa; Chemical: dopamine; Chemical: cocaine; Chemical: 6 - OHDA