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: Discontinuations from renovascular AEs , although less common than discontinuations from GI AEs , were significantly higher with etoricoxib .
### Output Text:
Discontinuations from renovascular AEs , although less common than discontinuations from GI AEs , were significantly higher with <span class="chemical">etoricoxib</span> . 