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We utilized a series of N - hydroxypyrazole - 5 - glycine ( NHP5G ) partial agonists at the GluN2 glutamate binding site as tools to study activation of GluN1 / GluN2A and GluN1 / GluN2D NMDA receptor subtypes .
 Chemical: N - hydroxypyrazole - 5 - glycine; Chemical: NHP5G; Chemical: glutamate; Chemical: NMDA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: N - hydroxypyrazole - 5 - glycine; Chemical: NHP5G; Chemical: glutamate; Chemical: NMDA