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: Likewise , in vivo , B6D2F1 mice were treated with etoposide , daunorubicin , and doxorubicin , with or without dexrazoxane over a wide range of doses : posttreatment , a full hematologic evaluation was done .
### Output Text:
Likewise , in vivo , B6D2F1 mice were treated with <span class="chemical">etoposide</span> , <span class="chemical">daunorubicin</span> , and <span class="chemical">doxorubicin</span> , with or without <span class="chemical">dexrazoxane</span> over a wide range of doses : posttreatment , a full hematologic evaluation was done . 