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: Unlike dl - sotalol , azimilide ( > 3 micromol / L ) increased epicardial APD markedly , causing a diminished TDR .
### Output Text:
Unlike dl - <span class="chemical">sotalol</span> , <span class="chemical">azimilide</span> ( > 3 micromol / L ) increased epicardial APD markedly , causing a diminished TDR . 