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: Routine EKG monitoring during infusional cyclophosphamide did not predict CHF development .
### Output Text:
Routine EKG monitoring during infusional <span class="chemical">cyclophosphamide</span> did not predict CHF development . 