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: Late - onset scleroderma renal crisis induced by tacrolimus and prednisolone : a case report .
### Output Text:
Late - onset scleroderma renal crisis induced by <span class="chemical">tacrolimus</span> and <span class="chemical">prednisolone</span> : a case report . 