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 recommended dose for phase III studies is paclitaxel 185 mg / m2 and carboplatin AUC 6 .
### Output Text:
The recommended dose for phase III studies is <span class="chemical">paclitaxel</span> 185 mg / m2 and <span class="chemical">carboplatin</span> AUC 6 . 