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: MEASUREMENTS AND MAIN RESULTS : None of 23 patients who received docetaxel alone developed VTE , whereas 9 of 47 patients ( 19 % ) who received docetaxel plus thalidomide developed VTE ( p = 0 . 025 ) .
### Output Text:
MEASUREMENTS AND MAIN RESULTS : None of 23 patients who received <span class="chemical">docetaxel</span> alone developed VTE , whereas 9 of 47 patients ( 19 % ) who received <span class="chemical">docetaxel</span> plus <span class="chemical">thalidomide</span> developed VTE ( p = 0 . 025 ) . 