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 reproducible model for producing diffuse myocardial injury ( epinephrine infusion ) has been developed to study the cardioprotective effects of agents or maneuvers which might alter the evolution of acute myocardial infarction .
### Output Text:
A reproducible model for producing diffuse myocardial injury ( <span class="chemical">epinephrine</span> infusion ) has been developed to study the cardioprotective effects of agents or maneuvers which might alter the evolution of acute myocardial infarction . 