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: Chemotherapy of advanced inoperable non - small cell lung cancer with paclitaxel : a phase II trial .
### Output Text:
Chemotherapy of advanced inoperable non - small cell lung cancer with <span class="chemical">paclitaxel</span> : a phase II trial . 