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 results suggest that bortezomib in combination with cyclophosphamide at 900 mg / m ( 2 ) and dexamethasone is an effective induction treatment for patients with newly diagnosed MM that warrants further investigation .
### Output Text:
The results suggest that <span class="chemical">bortezomib</span> in combination with <span class="chemical">cyclophosphamide</span> at 900 mg / m ( 2 ) and <span class="chemical">dexamethasone</span> is an effective induction treatment for patients with newly diagnosed MM that warrants further investigation . 