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: Cholesteryl hemisuccinate treatment protects rodents from the toxic effects of acetaminophen , adriamycin , carbon tetrachloride , chloroform and galactosamine .
### Output Text:
<span class="chemical">Cholesteryl hemisuccinate</span> treatment protects rodents from the toxic effects of <span class="chemical">acetaminophen</span> , <span class="chemical">adriamycin</span> , <span class="chemical">carbon tetrachloride</span> , <span class="chemical">chloroform</span> and <span class="chemical">galactosamine</span> . 