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: RESULTS : Patients randomly assigned to enalapril had a 33 % greater likelihood of decreased renal function than controls ( P = . 003 ) .
### Output Text:
RESULTS : Patients randomly assigned to <span class="chemical">enalapril</span> had a 33 % greater likelihood of decreased renal function than controls ( P = . 003 ) . 