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: Hemodynamic and antiadrenergic effects of dronedarone and amiodarone in animals with a healed myocardial infarction .
### Output Text:
Hemodynamic and antiadrenergic effects of <span class="chemical">dronedarone</span> and <span class="chemical">amiodarone</span> in animals with a healed myocardial infarction . 