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: Our data indicate that ER stress contributes to glucocorticoid - induced ocular hypertension and suggest that reducing ER stress has potential as a therapeutic strategy for treating glucocorticoid - induced glaucoma .
### Output Text:
Our data indicate that ER stress contributes to glucocorticoid - induced ocular hypertension and suggest that reducing ER stress has potential as a therapeutic strategy for treating glucocorticoid - induced glaucoma . 