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: D - ribose in the multiple doses of 200 mg / kg did not influence ADR cardiotoxicity .
### Output Text:
<span class="chemical">D - ribose</span> in the multiple doses of 200 mg / kg did not influence <span class="chemical">ADR</span> cardiotoxicity . 