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: Consequently , dronedarone might be particularly suitable for the treatment and prevention of various clinical arrhythmias , without compromising the left ventricular function .
### Output Text:
Consequently , <span class="chemical">dronedarone</span> might be particularly suitable for the treatment and prevention of various clinical arrhythmias , without compromising the left ventricular function . 