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Injection of group III mGluR agonists into the striatopallidal complex alleviates parkinsonian symptoms in 6 - hydroxydopamine - treated rats .
 Chemical: 6 - hydroxydopamine
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: 6 - hydroxydopamine 
Answer:
 Chemical: 6 - hydroxydopamine