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: Simvastatinezetimibe and escitalopram ( which she was taking for depression ) were discontinued , and other potential causes of hepatotoxicity were excluded .
### Output Text:
<span class="chemical">Simvastatinezetimibe</span> and <span class="chemical">escitalopram</span> ( which she was taking for depression ) were discontinued , and other potential causes of hepatotoxicity were excluded . 