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: Conversely , enalapril had a relative renoprotective effect ( RR 1 . 33 , 95 % CI 1 . 13 - 1 . 53 ) compared with placebo ( RR 1 . 96 , 95 % CI 1 . 57 - 2 . 44 ) in patients with diabetes .
### Output Text:
Conversely , <span class="chemical">enalapril</span> had a relative renoprotective effect ( RR 1 . 33 , 95 % CI 1 . 13 - 1 . 53 ) compared with placebo ( RR 1 . 96 , 95 % CI 1 . 57 - 2 . 44 ) in patients with diabetes . 