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: Effects of CD - 832 on isoproterenol ( ISO ) - induced myocardial ischemia were studied in dogs with partial coronary stenosis of the left circumflex coronary artery and findings were compared with those for nifedipine or diltiazem .
### Output Text:
Effects of <span class="chemical">CD - 832</span> on <span class="chemical">isoproterenol</span> ( <span class="chemical">ISO</span> ) - induced myocardial ischemia were studied in dogs with partial coronary stenosis of the left circumflex coronary artery and findings were compared with those for <span class="chemical">nifedipine</span> or <span class="chemical">diltiazem</span> . 