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 muscarinic cholinergic agonist pilocarpine induces in rats seizures and status epilepticus followed by widespread damage to the forebrain .
### Output Text:
The muscarinic cholinergic agonist <span class="chemical">pilocarpine</span> induces in rats seizures and status epilepticus followed by widespread damage to the forebrain . 