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: Large doses of triazolam repeatedly induced brief episodes of mania in a depressed elderly woman .
### Output Text:
Large doses of <span class="chemical">triazolam</span> repeatedly induced brief episodes of mania in a depressed elderly woman . 