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 rats in the control group were intraperitoneally ( i . p . ) injected with 0 . 9 % saline ( 4 ml / kg ) ; the rats in the model group were i . p . injected with CYP ( 150 mg / kg ) ; and the rats in the intervention group were i . p . injected with CYP with subsequently perfusion of bladder with P2X3 and NK1 receptors ' antagonists , Suramin and GR 82334 .
### Output Text:
The rats in the control group were intraperitoneally ( i . p . ) injected with 0 . 9 % saline ( 4 ml / kg ) ; the rats in the model group were i . p . injected with <span class="chemical">CYP</span> ( 150 mg / kg ) ; and the rats in the intervention group were i . p . injected with <span class="chemical">CYP</span> with subsequently perfusion of bladder with P2X3 and NK1 receptors ' antagonists , <span class="chemical">Suramin</span> and <span class="chemical">GR 82334</span> . 