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: CONCLUSIONS : Lipid emulsion with or without epinephrine , or epinephrine alone were equally effective in achieving a return to spontaneous circulation in this model of LAST .
### Output Text:
CONCLUSIONS : Lipid emulsion with or without <span class="chemical">epinephrine</span> , or <span class="chemical">epinephrine</span> alone were equally effective in achieving a return to spontaneous circulation in this model of LAST . 