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 evoke postsynaptic dopamine receptor - stimulating behavioral signs such as stereotypy and hyperlocomotion in rats .
### Output Text:
<span class="chemical">Carteolol</span> did not evoke postsynaptic <span class="chemical">dopamine</span> receptor - stimulating behavioral signs such as stereotypy and hyperlocomotion in rats . 