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: CIN developed in 25 . 5 % patients who underwent chemotherapy and in 11 % patients who did not ( P = 0 . 1 ) .
### Output Text:
CIN developed in 25 . 5 % patients who underwent chemotherapy and in 11 % patients who did not ( P = 0 . 1 ) . 