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 sudden onset of respiratory distress , rash , and a history of a new medicine led the two paramedics on the scene to administer subcutaneous epinephrine .
### Output Text:
The sudden onset of respiratory distress , rash , and a history of a new medicine led the two paramedics on the scene to administer subcutaneous <span class="chemical">epinephrine</span> . 