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 , as well as propranolol and biperiden , inhibited the haloperidol - induced catalepsy .
### Output Text:
<span class="chemical">Carteolol</span> , as well as <span class="chemical">propranolol</span> and <span class="chemical">biperiden</span> , inhibited the <span class="chemical">haloperidol</span> - induced catalepsy . 