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: Using a rat model of adriamycin - induced cardiomyopathy , we tested the hypothesis that abnormal cardiac adrenergic neuron activity may appear and be exacerbated dose - dependently in adriamycin cardiomyopathy .
### Output Text:
Using a rat model of <span class="chemical">adriamycin</span> - induced cardiomyopathy , we tested the hypothesis that abnormal cardiac adrenergic neuron activity may appear and be exacerbated dose - dependently in <span class="chemical">adriamycin</span> cardiomyopathy . 