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: Analysis was performed on 61 women with chemotherapy - responsive metastatic breast cancer receiving 96 - h infusional cyclophosphamide as part of a triple sequential high - dose regimen to assess association between presence of peritransplant congestive heart failure ( CHF ) and the following pretreatment characteristics : presence of electrocardiogram ( EKG ) abnormalities , age , hypertension , prior cardiac history , smoking , diabetes mellitus , prior use of anthracyclines , and left - sided chest irradiation .
### Output Text:
Analysis was performed on 61 women with chemotherapy - responsive metastatic breast cancer receiving 96 - h infusional <span class="chemical">cyclophosphamide</span> as part of a triple sequential high - dose regimen to assess association between presence of peritransplant congestive heart failure ( CHF ) and the following pretreatment characteristics : presence of electrocardiogram ( EKG ) abnormalities , age , hypertension , prior cardiac history , smoking , diabetes mellitus , prior use of <span class="chemical">anthracyclines</span> , and left - sided chest irradiation . 