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: Our analysis suggests that those patients receiving the dosing schedule of 100 mg / m ( 2 ) cisplatin every 3 weeks and those with hypertension are at the greatest risk of nephrotoxicity and would benefit from the addition of mannitol .
### Output Text:
Our analysis suggests that those patients receiving the dosing schedule of 100 mg / m ( 2 ) <span class="chemical">cisplatin</span> every 3 weeks and those with hypertension are at the greatest risk of nephrotoxicity and would benefit from the addition of <span class="chemical">mannitol</span> . 