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: In sodium repleted animals indomethacin did not change systolic blood pressure ( BP ) although plasma renin activity was decreased .
### Output Text:
In <span class="chemical">sodium</span> repleted animals <span class="chemical">indomethacin</span> did not change systolic blood pressure ( BP ) although plasma renin activity was decreased . 