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: During [ 24 - 14C ] sodium deoxycholate infusion , [ 14C ] biliary bile acid secretion increased , but bile flow did not change significantly in either control or ethinyl estradiol - treated rats .
### Output Text:
During [ 24 - 14C ] <span class="chemical">sodium deoxycholate</span> infusion , [ 14C ] biliary <span class="chemical">bile acid</span> secretion increased , but bile flow did not change significantly in either control or <span class="chemical">ethinyl estradiol</span> - treated rats . 