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: To quantify this population , the total number of ectopic hilar granule cells was estimated using unbiased stereology at different times after pilocarpine - induced status epilepticus .
### Output Text:
To quantify this population , the total number of ectopic hilar granule cells was estimated using unbiased stereology at different times after <span class="chemical">pilocarpine</span> - induced status epilepticus . 