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 findings result in a model that allows the testing of protectors against doxorubicin - induced cardiotoxicity as demonstrated by the protection provided by ICRF - 187 .
### Output Text:
These findings result in a model that allows the testing of protectors against <span class="chemical">doxorubicin</span> - induced cardiotoxicity as demonstrated by the protection provided by <span class="chemical">ICRF - 187</span> . 