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 male Wistar rats consuming a diet that contained LiCl ( 60 mmol / kg ) for 4 weeks developed marked polyuria .
### Output Text:
The male Wistar rats consuming a diet that contained <span class="chemical">LiCl</span> ( 60 mmol / kg ) for 4 weeks developed marked polyuria . 