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: Diagnosis of this potentially fatal complication may be delayed or missed if renal tissue or the peripheral blood smear is not examined , because renal failure may be ascribed to cisplatin nephrotoxicity and the anemia and thrombocytopenia to drug - induced bone marrow suppression .
### Output Text:
Diagnosis of this potentially fatal complication may be delayed or missed if renal tissue or the peripheral blood smear is not examined , because renal failure may be ascribed to <span class="chemical">cisplatin</span> nephrotoxicity and the anemia and thrombocytopenia to drug - induced bone marrow suppression . 