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: RESULTS : Bilateral infusions of neurotensin into the globus pallidus reversed haloperidol - induced parkinsonian catalepsy in rats .
### Output Text:
RESULTS : Bilateral infusions of <span class="chemical">neurotensin</span> into the globus pallidus reversed <span class="chemical">haloperidol</span> - induced parkinsonian catalepsy in rats . 