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: The hemodynamic and antiadrenergic effects of dronedarone , a noniodinated compound structurally related to amiodarone , were compared with those of amiodarone after prolonged oral administration , both at rest and during sympathetic stimulation in conscious dogs with a healed myocardial infarction .
### Output Text:
The hemodynamic and antiadrenergic effects of <span class="chemical">dronedarone</span> , a noniodinated compound structurally related to <span class="chemical">amiodarone</span> , were compared with those of <span class="chemical">amiodarone</span> after prolonged oral administration , both at rest and during sympathetic stimulation in conscious dogs with a healed myocardial infarction . 