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: With this model , we were able to identify diffuse cortical hypoxia in the puromycin aminonucleoside - induced nephrotic syndrome and focal and segmental hypoxia in the remnant kidney model .
### Output Text:
With this model , we were able to identify diffuse cortical hypoxia in the <span class="chemical">puromycin aminonucleoside</span> - induced nephrotic syndrome and focal and segmental hypoxia in the remnant kidney model . 