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: Older age was associated with a greater risk of developing decreased renal function in both groups , but significantly more so in the enalapril group ( enalapril : risk ratio [ RR ] 1 . 42 per 10 years , 95 % confidence interval [ CI ] 1 . 32 - 1 . 52 with enalapril ; placebo : RR 1 . 18 , 95 % CI 1 . 12 - 1 . 25 ) .
### Output Text:
Older age was associated with a greater risk of developing decreased renal function in both groups , but significantly more so in the <span class="chemical">enalapril</span> group ( <span class="chemical">enalapril</span> : risk ratio [ RR ] 1 . 42 per 10 years , 95 % confidence interval [ CI ] 1 . 32 - 1 . 52 with <span class="chemical">enalapril</span> ; placebo : RR 1 . 18 , 95 % CI 1 . 12 - 1 . 25 ) . 