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: Cardiovascular effects of hypotension induced by adenosine triphosphate and sodium nitroprusside on dogs with denervated hearts .
### Output Text:
Cardiovascular effects of hypotension induced by <span class="chemical">adenosine triphosphate</span> and <span class="chemical">sodium nitroprusside</span> on dogs with denervated hearts . 