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: The effect of the converting enzyme inhibitor ( CEI ) enalapril was assessed in Munich - Wistar rats with established adriamycin nephrosis .
### Output Text:
The effect of the converting enzyme inhibitor ( CEI ) <span class="chemical">enalapril</span> was assessed in Munich - Wistar rats with established <span class="chemical">adriamycin</span> nephrosis . 