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: In this study , we evaluate the role DRD2 plays in chlorpromazine - induced EPS in schizophrenic patients .
### Output Text:
In this study , we evaluate the role DRD2 plays in <span class="chemical">chlorpromazine</span> - induced EPS in schizophrenic patients . 