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: The data suggest that the dipyridamole - induced myocardial ischemia is caused by the inhomogenous distribution of myocardial blood flow .
### Output Text:
The data suggest that the <span class="chemical">dipyridamole</span> - induced myocardial ischemia is caused by the inhomogenous distribution of myocardial blood flow . 