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 neurotensin type - 1 receptor antagonist SR48692 blocked both the behavioral and the electrophysiological effects induced by neurotensin .
### Output Text:
The <span class="chemical">neurotensin type - 1 receptor antagonist</span> <span class="chemical">SR48692</span> blocked both the behavioral and the electrophysiological effects induced by <span class="chemical">neurotensin</span> . 