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: Control rats were found to have a lower capacity to transport deoxycholic acid than taurodeoxycholic acid , and both were decreased by ethinyl estradiol treatment .
### Output Text:
Control rats were found to have a lower capacity to transport <span class="chemical">deoxycholic acid</span> than <span class="chemical">taurodeoxycholic acid</span> , and both were decreased by <span class="chemical">ethinyl estradiol</span> treatment . 