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: Adenosine triphosphate ( ATP ) and sodium nitroprusside ( SNP ) are administered to patients to induce and control hypotension during anesthesia .
### Output Text:
<span class="chemical">Adenosine triphosphate</span> ( <span class="chemical">ATP</span> ) and <span class="chemical">sodium nitroprusside</span> ( <span class="chemical">SNP</span> ) are administered to patients to induce and control hypotension during anesthesia . 