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 : For the 60 patients who completed phase A , standard - dose haloperidol was efficacious and superior to both low - dose haloperidol and placebo for scores on the Brief Psychiatric Rating Scale psychosis factor and on psychomotor agitation .
### Output Text:
RESULTS : For the 60 patients who completed phase A , standard - dose <span class="chemical">haloperidol</span> was efficacious and superior to both low - dose <span class="chemical">haloperidol</span> and placebo for scores on the Brief Psychiatric Rating Scale psychosis factor and on psychomotor agitation . 