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: OBJECTIVE : To test the hypothesis that , in lifetime captopril - treated spontaneously hypertensive rats ( SHR ) , the sympathetic nervous system contributes importantly to the hypertensive effect of dietary sodium chloride supplementation .
### Output Text:
OBJECTIVE : To test the hypothesis that , in lifetime <span class="chemical">captopril</span> - treated spontaneously hypertensive rats ( SHR ) , the sympathetic nervous system contributes importantly to the hypertensive effect of <span class="chemical">dietary sodium chloride</span> supplementation . 