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: The results of the present study suggested that Hibiscus rosa sinensis had a protective role against reserpine - induced orofacial dyskinesia and oxidative stress .
### Output Text:
The results of the present study suggested that <span class="chemical">Hibiscus rosa sinensis</span> had a protective role against <span class="chemical">reserpine</span> - induced orofacial dyskinesia and oxidative stress . 