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: CONCLUSIONS : The results indicated a favorable therapeutic profile for haloperidol in doses of 2 - 3 mg / day , although a subgroup developed moderate to severe extrapyramidal signs .
### Output Text:
CONCLUSIONS : The results indicated a favorable therapeutic profile for <span class="chemical">haloperidol</span> in doses of 2 - 3 mg / day , although a subgroup developed moderate to severe extrapyramidal signs . 