3073
However , in field conditions , treatment may be delayed and with the exception of NMDA receptor antagonists , currently no drug provides protection ( against lethality , seizures , SRBD and neurological consequences ) when seizures are left unabated for one hour or more .
 NMDA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 NMDA