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: Kinin B2 receptor deletion and blockage ameliorates cisplatin - induced acute renal injury .
### Output Text:
Kinin B2 receptor deletion and blockage ameliorates <span class="chemical">cisplatin</span> - induced acute renal injury . 