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However , the huge discrepancy between the EC50 value and IC50 value of B12H , to protect against neuronal toxicity ( 0 . 09 mu M ) and to block the NMDA receptor ( 21 . 8 mu M ) respectively , suggests that the neuroprotection of B12H might be not primarily due to the blockade of the NMDA receptor .
 Chemical: B12H; Chemical: NMDA; Chemical: B12H; 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: B12H; Chemical: NMDA; Chemical: B12H; Chemical: NMDA