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: Within 14 days of the oral bisphosphonate ( alendronate sodium ) administration , the amount of daily urinary protein increased rapidly up to 12 . 8 g with acute renal failure .
### Output Text:
Within 14 days of the oral <span class="chemical">bisphosphonate</span> ( <span class="chemical">alendronate sodium</span> ) administration , the amount of daily urinary protein increased rapidly up to 12 . 8 g with acute renal failure . 