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: On admission , clinical symptoms ( i . e . arthralgia and fever ) and laboratory findings ( i . e . eosinophilia and renal failure ) suggested AIN , and which was confirmed by pathologic findings on renal biopsy .
### Output Text:
On admission , clinical symptoms ( i . e . arthralgia and fever ) and laboratory findings ( i . e . eosinophilia and renal failure ) suggested AIN , and which was confirmed by pathologic findings on renal biopsy . 