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: Carteolol did not antagonize the inhibitory effects of haloperidol on apomorphine - induced stereotypy and locomotor activity in rats .
### Output Text:
<span class="chemical">Carteolol</span> did not antagonize the inhibitory effects of <span class="chemical">haloperidol</span> on <span class="chemical">apomorphine</span> - induced stereotypy and locomotor activity in rats . 