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: These results strongly suggest that carteolol improves haloperidol - induced catalepsy via its beta - adrenoceptor antagonistic activity and is expected to be effective in the treatment of akathisia without attenuating neuroleptic - induced antipsychotic effects due to its postsynaptic dopamine receptor antagonistic activity .
### Output Text:
These results strongly suggest that <span class="chemical">carteolol</span> improves <span class="chemical">haloperidol</span> - induced catalepsy via its beta - adrenoceptor antagonistic activity and is expected to be effective in the treatment of akathisia without attenuating neuroleptic - induced antipsychotic effects due to its postsynaptic <span class="chemical">dopamine</span> receptor antagonistic activity . 