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: Effect of Hibiscus rosa sinensis on reserpine - induced neurobehavioral and biochemical alterations in rats .
### Output Text:
Effect of <span class="chemical">Hibiscus rosa sinensis</span> on <span class="chemical">reserpine</span> - induced neurobehavioral and biochemical alterations in rats . 