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: Coenzyme Q10 treatment ameliorates acute cisplatin nephrotoxicity in mice .
### Output Text:
<span class="chemical">Coenzyme Q10</span> treatment ameliorates acute <span class="chemical">cisplatin</span> nephrotoxicity in mice . 