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: We describe a 70 - year - old Hispanic woman who developed fulminant hepatic failure necessitating liver transplantation 10 weeks after conversion from simvastatin 40 mg / day to simvastatin 10 mg - ezetimibe 40 mg / day .
### Output Text:
We describe a 70 - year - old Hispanic woman who developed fulminant hepatic failure necessitating liver transplantation 10 weeks after conversion from <span class="chemical">simvastatin</span> 40 mg / day to <span class="chemical">simvastatin 10 mg - ezetimibe 40 mg</span> / day . 