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: Furthermore , dexamethasone - induced ocular hypertension was associated with chronic ER stress of the trabecular meshwork ( TM ) .
### Output Text:
Furthermore , <span class="chemical">dexamethasone</span> - induced ocular hypertension was associated with chronic ER stress of the trabecular meshwork ( TM ) . 