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: Three patients had acute viral myocarditis , one had a carbamazepine - induced acute eosinophilic myocarditis , and one had cardiac hemosiderosis resulting in acute cardiogenic shock .
### Output Text:
Three patients had acute viral myocarditis , one had a <span class="chemical">carbamazepine</span> - induced acute eosinophilic myocarditis , and one had cardiac hemosiderosis resulting in acute cardiogenic shock . 