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This effect is prevented by 2 - methyl - 6 - ( phenylethynyl ) pyridine hydrochloride ( MPEP ) , a selective mGlu5R antagonist .
 2 - methyl - 6 - ( phenylethynyl ) pyridine hydrochloride, MPEP
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 2 - methyl - 6 - ( phenylethynyl ) pyridine hydrochloride, MPEP