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: RESULTS : Six of 61 women ( 10 % ) developed clinically reversible grade 3 CHF following infusional cyclophosphamide with a median percent decline in ejection fraction of 31 % .
### Output Text:
RESULTS : Six of 61 women ( 10 % ) developed clinically reversible grade 3 CHF following infusional <span class="chemical">cyclophosphamide</span> with a median percent decline in ejection fraction of 31 % . 