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: METHODS : Male SHR ( aged 6 weeks ) that had been treated from conception onward with either captopril or vehicle remained on a basal sodium chloride diet or were fed a high sodium chloride diet .
### Output Text:
METHODS : Male SHR ( aged 6 weeks ) that had been treated from conception onward with either <span class="chemical">captopril</span> or vehicle remained on a basal <span class="chemical">sodium chloride</span> diet or were fed a high <span class="chemical">sodium chloride</span> diet . 