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: Of note , although azimilide ( 3 to 10 micromol / L ) increased APD more than dl - sotalol , its EADs often failed to propagate transmurally , probably because of a diminished TDR .
### Output Text:
Of note , although <span class="chemical">azimilide</span> ( 3 to 10 micromol / L ) increased APD more than dl - <span class="chemical">sotalol</span> , its EADs often failed to propagate transmurally , probably because of a diminished TDR . 