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: Accordingly , among the 15 CIN patients ( 18 . 75 % ) , 7 . 5 % of the patients in group A had increased risk and 3 . 75 % had renal injury , whereas 5 % of group B had increased risk and 2 . 5 % had renal injury .
### Output Text:
Accordingly , among the 15 CIN patients ( 18 . 75 % ) , 7 . 5 % of the patients in group A had increased risk and 3 . 75 % had renal injury , whereas 5 % of group B had increased risk and 2 . 5 % had renal injury . 