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: Baseline renal ACE did not correlate with focal glomerulosclerosis ( r = 0 . 22 , NS ) .
### Output Text:
Baseline renal ACE did not correlate with focal glomerulosclerosis ( r = 0 . 22 , NS ) . 