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: It is likely that the hypersensitivity ( eosinophilic ) myocarditis was related to dobutamine infusion therapy .
### Output Text:
It is likely that the hypersensitivity ( eosinophilic ) myocarditis was related to <span class="chemical">dobutamine</span> infusion therapy . 