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: The protection from gentamicin nephrotoxicity was studied in non - diabetic rats with chronic solute diuresis induced by blockage of tubular glucose reabsorption with phlorizin ( P ) .
### Output Text:
The protection from <span class="chemical">gentamicin</span> nephrotoxicity was studied in non - diabetic rats with chronic solute diuresis induced by blockage of tubular <span class="chemical">glucose</span> reabsorption with <span class="chemical">phlorizin</span> ( <span class="chemical">P</span> ) . 