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: In conclusion , clentiazem attenuated epinephrine - induced cardiac injury , possibly through its effect on the adrenergic pathway .
### Output Text:
In conclusion , <span class="chemical">clentiazem</span> attenuated <span class="chemical">epinephrine</span> - induced cardiac injury , possibly through its effect on the adrenergic pathway . 