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: The results provide new insight into the potential role of ectopic hilar granule cells in the pilocarpine model of temporal lobe epilepsy .
### Output Text:
The results provide new insight into the potential role of ectopic hilar granule cells in the <span class="chemical">pilocarpine</span> model of temporal lobe epilepsy . 