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 influence of d - ribose on adriamycin - induced myocardiopathy in rats was studied .
### Output Text:
The influence of <span class="chemical">d - ribose</span> on <span class="chemical">adriamycin</span> - induced myocardiopathy in rats was studied . 