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: RESULTS : Acetaminophen - induced ALF patients undergoing LT had a greater severity of pre - LT illness reflected by higher Acute Physiology and Chronic Health Evaluation II scores and requirement for organ support compared with the other two groups .
### Output Text:
RESULTS : <span class="chemical">Acetaminophen</span> - induced ALF patients undergoing LT had a greater severity of pre - LT illness reflected by higher Acute Physiology and Chronic Health Evaluation II scores and requirement for organ support compared with the other two groups . 