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: Dopamine antagonist fluphenazine , D - 1 antagonist SCH 23390 or D - 2 antagonist sulpiride induced catalepsy .
### Output Text:
<span class="chemical">Dopamine</span> antagonist <span class="chemical">fluphenazine</span> , D - 1 antagonist <span class="chemical">SCH 23390</span> or D - 2 antagonist <span class="chemical">sulpiride</span> induced catalepsy . 