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Ketamine , a noncompetitive N - methyl - D - aspartate ( NMDA ) receptor antagonist , is frequently used in pediatric general anesthesia .
 Chemical: Ketamine; Chemical: N - methyl - D - aspartate; Chemical: NMDA
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: Ketamine; Chemical: N - methyl - D - aspartate; Chemical: NMDA