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: Rates of Renal Toxicity in Cancer Patients Receiving Cisplatin With and Without Mannitol .
### Output Text:
Rates of Renal Toxicity in Cancer Patients Receiving <span class="chemical">Cisplatin</span> With and Without <span class="chemical">Mannitol</span> . 