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: These data show that CD - 832 improves myocardial ischemia during ISO infusion with stenosis and suggest that the negative chronotropic property of CD - 832 plays a major role in the beneficial effects of CD - 832 .
### Output Text:
These data show that <span class="chemical">CD - 832</span> improves myocardial ischemia during <span class="chemical">ISO</span> infusion with stenosis and suggest that the negative chronotropic property of <span class="chemical">CD - 832</span> plays a major role in the beneficial effects of <span class="chemical">CD - 832</span> . 