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: Finally , to show that the bladder is essential for the CP - induced behavioral modifications , female rats also received CP at doses of 200 mg . / kg .
### Output Text:
Finally , to show that the bladder is essential for the <span class="chemical">CP</span> - induced behavioral modifications , female rats also received <span class="chemical">CP</span> at doses of 200 mg . / kg . 