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: A sixty - year - old woman with advanced breast cancer , previously treated with cisplatin , developed an irreversible lethal renal failure with anuria , the day after 5 g / m2 bolus ifosfamide .
### Output Text:
A sixty - year - old woman with advanced breast cancer , previously treated with <span class="chemical">cisplatin</span> , developed an irreversible lethal renal failure with anuria , the day after 5 g / m2 bolus <span class="chemical">ifosfamide</span> . 