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: VIP ( - / - ) mice exhibit altered bladder function and neurochemical properties in micturition pathways after cyclophosphamide ( CYP ) - induced cystitis .
### Output Text:
VIP ( - / - ) mice exhibit altered bladder function and neurochemical properties in micturition pathways after <span class="chemical">cyclophosphamide</span> ( <span class="chemical">CYP</span> ) - induced cystitis . 