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: To our knowledge , this is the first case report of simvastatin - ezetimibe - induced liver failure that resulted in liver transplantation .
### Output Text:
To our knowledge , this is the first case report of <span class="chemical">simvastatin - ezetimibe</span> - induced liver failure that resulted in liver transplantation . 