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: Treatment of WT mice with topical ocular 0 . 1 % dexamethasone led to elevation of intraocular pressure ( IOP ) , functional and structural loss of retinal ganglion cells , and axonal degeneration , resembling glucocorticoid - induced glaucoma in human patients .
### Output Text:
Treatment of WT mice with topical ocular 0 . 1 % <span class="chemical">dexamethasone</span> led to elevation of intraocular pressure ( IOP ) , functional and structural loss of retinal ganglion cells , and axonal degeneration , resembling glucocorticoid - induced glaucoma in human patients . 