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: Increased sulfation and decreased 7alpha - hydroxylation of deoxycholic acid in ethinyl estradiol - induced cholestasis in rats .
### Output Text:
Increased sulfation and decreased 7alpha - hydroxylation of <span class="chemical">deoxycholic acid</span> in <span class="chemical">ethinyl estradiol</span> - induced cholestasis in rats . 