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: Sodium nitroprusside is a non - selective arteriolar and venous vasodilator that can produce redistribution of blood flow away from the kidney during induced hypotension .
### Output Text:
Sodium <span class="chemical">nitroprusside</span> is a non - selective arteriolar and venous vasodilator that can produce redistribution of blood flow away from the kidney during induced hypotension . 