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We investigated effects of subchronic treatment with the NMDA antagonist memantine by using behavioural observation and multimodal MRI .
 Chemical: NMDA; Chemical: memantine
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: NMDA; Chemical: memantine