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: Severe reversible left ventricular systolic and diastolic dysfunction due to accidental iatrogenic epinephrine overdose .
### Output Text:
Severe reversible left ventricular systolic and diastolic dysfunction due to accidental iatrogenic <span class="chemical">epinephrine</span> overdose . 