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: These results indicate that status epilepticus induced by pilocarpine is initiated by cholinergic overstimulation and propagated by glutamatergic transmission , the elevation of which may cause brain damage through an excitatory NMDA receptor - mediated mechanism .
### Output Text:
These results indicate that status epilepticus induced by <span class="chemical">pilocarpine</span> is initiated by cholinergic overstimulation and propagated by glutamatergic transmission , the elevation of which may cause brain damage through an excitatory <span class="chemical">NMDA</span> receptor - mediated mechanism . 