138573
CPCCOEt is a drug used in scientific research , which acts as a non-competitive antagonist at the metabotropic glutamate receptor subtype mGluR1 , with high selectivity although only moderate binding affinity .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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