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: A report is given on an 83 - year - old female who acquired central vein thrombosis in her seeing eye one day after having started topical medication with dipivalyl epinephrine for advanced glaucoma discovered in the other eye .
### Output Text:
A report is given on an 83 - year - old female who acquired central vein thrombosis in her seeing eye one day after having started topical medication with <span class="chemical">dipivalyl epinephrine</span> for advanced glaucoma discovered in the other eye . 