In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: Haloperidol - induced catalepsy was challenged with prior intracollicular microinjections of glutamate NMDA receptor antagonists , MK - 801 ( 15 or 30 mmol / 0 . 5 microl ) and AP7 ( 10 or 20 nmol / 0 . 5 microl ) , or of the NMDA receptor agonist N - methyl - d - aspartate ( NMDA , 20 or 30 nmol / 0 . 5 microl ) .
### Output Text:
<span class="chemical">Haloperidol</span> - induced catalepsy was challenged with prior intracollicular microinjections of <span class="chemical">glutamate</span> <span class="chemical">NMDA</span> receptor antagonists , <span class="chemical">MK - 801</span> ( 15 or 30 mmol / 0 . 5 microl ) and <span class="chemical">AP7</span> ( 10 or 20 nmol / 0 . 5 microl ) , or of the <span class="chemical">NMDA</span> receptor agonist <span class="chemical">N - methyl - d - aspartate</span> ( <span class="chemical">NMDA</span> , 20 or 30 nmol / 0 . 5 microl ) . 