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 the time interval between monoHER and doxorubicin administration on the protection against doxorubicin - induced cardiotoxicity in mice .
### Output Text:
The influence of the time interval between <span class="chemical">monoHER</span> and <span class="chemical">doxorubicin</span> administration on the protection against <span class="chemical">doxorubicin</span> - induced cardiotoxicity in mice . 