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: Prolongation of QT interval , torsades de pointes , and sudden cardiac death have been reported after concomitant administration with erythromycin or azole antifungal agents , but not with other CYP3A4 inhibitors .
### Output Text:
Prolongation of QT interval , torsades de pointes , and sudden cardiac death have been reported after concomitant administration with <span class="chemical">erythromycin</span> or <span class="chemical">azole</span> antifungal agents , but not with other CYP3A4 inhibitors . 