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: Further phase II studies with paclitaxel combined with other drugs active against NSCLC are indicated , and phase III studies comparing paclitaxel with standard chemotherapy remain to be completed .
### Output Text:
Further phase II studies with <span class="chemical">paclitaxel</span> combined with other drugs active against NSCLC are indicated , and phase III studies comparing <span class="chemical">paclitaxel</span> with standard chemotherapy remain to be completed . 