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: A 35 - year - old woman whose cervix uteri was inadvertently injected with 8 mg of epinephrine developed myocardial stunning that was characterized by severe hemodynamic compromise , profound , albeit transient , left ventricular systolic and diastolic dysfunction , and only modestly elevated biochemical markers of myocardial necrosis .
### Output Text:
A 35 - year - old woman whose cervix uteri was inadvertently injected with 8 mg of <span class="chemical">epinephrine</span> developed myocardial stunning that was characterized by severe hemodynamic compromise , profound , albeit transient , left ventricular systolic and diastolic dysfunction , and only modestly elevated biochemical markers of myocardial necrosis . 