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: We compared the effects of 17beta - estradiol in adult male and ovariectomized female rats subjected to lithium - pilocarpine - induced SE .
### Output Text:
We compared the effects of <span class="chemical">17beta - estradiol</span> in adult male and ovariectomized female rats subjected to <span class="chemical">lithium</span> - <span class="chemical">pilocarpine</span> - induced SE . 