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: Chronic effects of a novel synthetic anthracycline derivative ( SM - 5887 ) on normal heart and doxorubicin - induced cardiomyopathy in beagle dogs .
### Output Text:
Chronic effects of a novel synthetic <span class="chemical">anthracycline</span> derivative ( <span class="chemical">SM - 5887</span> ) on normal heart and <span class="chemical">doxorubicin</span> - induced cardiomyopathy in beagle dogs . 