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: Medical and psychiatric outcomes for patients transplanted for acetaminophen - induced acute liver failure : a case - control study .
### Output Text:
Medical and psychiatric outcomes for patients transplanted for <span class="chemical">acetaminophen</span> - induced acute liver failure : a case - control study . 